Asymmetric/Biological Unit(hide GO term definitions)
Chain A ( IL2_HUMAN | P60568)
molecular function |
| GO:0005088 | | Ras guanyl-nucleotide exchange factor activity | | Stimulates the exchange of guanyl nucleotides associated with a GTPase of the Ras superfamily. Under normal cellular physiological conditions, the concentration of GTP is higher than that of GDP, favoring the replacement of GDP by GTP in association with the GTPase. |
| GO:0030246 | | carbohydrate binding | | Interacting selectively and non-covalently with any carbohydrate, which includes monosaccharides, oligosaccharides and polysaccharides as well as substances derived from monosaccharides by reduction of the carbonyl group (alditols), by oxidation of one or more hydroxy groups to afford the corresponding aldehydes, ketones, or carboxylic acids, or by replacement of one or more hydroxy group(s) by a hydrogen atom. Cyclitols are generally not regarded as carbohydrates. |
| GO:0005125 | | cytokine activity | | Functions to control the survival, growth, differentiation and effector function of tissues and cells. |
| GO:0043208 | | glycosphingolipid binding | | Interacting selectively and non-covalently with glycosphingolipid, a compound with residues of sphingoid and at least one monosaccharide. |
| GO:0008083 | | growth factor activity | | The function that stimulates a cell to grow or proliferate. Most growth factors have other actions besides the induction of cell growth or proliferation. |
| GO:0005134 | | interleukin-2 receptor binding | | Interacting selectively and non-covalently with the interleukin-2 receptor. |
| GO:0031851 | | kappa-type opioid receptor binding | | Interacting selectively and non-covalently with a kappa-type opioid receptor. |
| GO:0019209 | | kinase activator activity | | Binds to and increases the activity of a kinase, an enzyme which catalyzes of the transfer of a phosphate group, usually from ATP, to a substrate molecule. |
biological process |
| GO:0007186 | | G-protein coupled receptor signaling pathway | | A series of molecular signals that proceeds with an activated receptor promoting the exchange of GDP for GTP on the alpha-subunit of an associated heterotrimeric G-protein complex. The GTP-bound activated alpha-G-protein then dissociates from the beta- and gamma-subunits to further transmit the signal within the cell. The pathway begins with receptor-ligand interaction, or for basal GPCR signaling the pathway begins with the receptor activating its G protein in the absence of an agonist, and ends with regulation of a downstream cellular process, e.g. transcription. The pathway can start from the plasma membrane, Golgi or nuclear membrane (PMID:24568158 and PMID:16902576). |
| GO:0000165 | | MAPK cascade | | An intracellular protein kinase cascade containing at least a MAPK, a MAPKK and a MAP3K. The cascade can also contain two additional tiers: the upstream MAP4K and the downstream MAP Kinase-activated kinase (MAPKAPK). The kinases in each tier phosphorylate and activate the kinases in the downstream tier to transmit a signal within a cell. |
| GO:0030217 | | T cell differentiation | | The process in which a precursor cell type acquires characteristics of a more mature T-cell. A T cell is a type of lymphocyte whose definin characteristic is the expression of a T cell receptor complex. |
| GO:0002250 | | adaptive immune response | | An immune response mediated by cells expressing specific receptors for antigen produced through a somatic diversification process, and allowing for an enhanced secondary response to subsequent exposures to the same antigen (immunological memory). |
| GO:0007155 | | cell adhesion | | The attachment of a cell, either to another cell or to an underlying substrate such as the extracellular matrix, via cell adhesion molecules. |
| GO:0007267 | | cell-cell signaling | | Any process that mediates the transfer of information from one cell to another. This process includes signal transduction in the receiving cell and, where applicable, release of a ligand and any processes that actively facilitate its transport and presentation to the receiving cell. Examples include signaling via soluble ligands, via cell adhesion molecules and via gap junctions. |
| GO:0097192 | | extrinsic apoptotic signaling pathway in absence of ligand | | A series of molecular signals in which a signal is conveyed from the cell surface to trigger the apoptotic death of a cell. The pathway starts with withdrawal of a ligand from a cell surface receptor, and ends when the execution phase of apoptosis is triggered. |
| GO:0006955 | | immune response | | Any immune system process that functions in the calibrated response of an organism to a potential internal or invasive threat. |
| GO:0002376 | | immune system process | | Any process involved in the development or functioning of the immune system, an organismal system for calibrated responses to potential internal or invasive threats. |
| GO:0030101 | | natural killer cell activation | | The change in morphology and behavior of a natural killer cell in response to a cytokine, chemokine, cellular ligand, or soluble factor. |
| GO:0002903 | | negative regulation of B cell apoptotic process | | Any process that stops, prevents, or reduces the frequency, rate, or extent of B cell apoptotic process. |
| GO:0043066 | | negative regulation of apoptotic process | | Any process that stops, prevents, or reduces the frequency, rate or extent of cell death by apoptotic process. |
| GO:0045822 | | negative regulation of heart contraction | | Any process that stops, prevents, or reduces the frequency, rate or extent of heart contraction. |
| GO:0050728 | | negative regulation of inflammatory response | | Any process that stops, prevents, or reduces the frequency, rate or extent of the inflammatory response. |
| GO:0050672 | | negative regulation of lymphocyte proliferation | | Any process that stops, prevents or reduces the rate or extent of lymphocyte proliferation. |
| GO:0001933 | | negative regulation of protein phosphorylation | | Any process that stops, prevents or reduces the rate of addition of phosphate groups to amino acids within a protein. |
| GO:0030890 | | positive regulation of B cell proliferation | | Any process that activates or increases the rate or extent of B cell proliferation. |
| GO:0043547 | | positive regulation of GTPase activity | | Any process that activates or increases the activity of a GTPase. |
| GO:0045582 | | positive regulation of T cell differentiation | | Any process that activates or increases the frequency, rate or extent of T cell differentiation. |
| GO:0042102 | | positive regulation of T cell proliferation | | Any process that activates or increases the rate or extent of T cell proliferation. |
| GO:0042104 | | positive regulation of activated T cell proliferation | | Any process that activates or increases the rate or extent of activated T cell proliferation. |
| GO:0030307 | | positive regulation of cell growth | | Any process that activates or increases the frequency, rate, extent or direction of cell growth. |
| GO:0008284 | | positive regulation of cell proliferation | | Any process that activates or increases the rate or extent of cell proliferation. |
| GO:0007204 | | positive regulation of cytosolic calcium ion concentration | | Any process that increases the concentration of calcium ions in the cytosol. |
| GO:0060999 | | positive regulation of dendritic spine development | | Any process that increases the rate, frequency, or extent of dendritic spine development, the process whose specific outcome is the progression of the dendritic spine over time, from its formation to the mature structure. |
| GO:0051024 | | positive regulation of immunoglobulin secretion | | Any process that activates or increases the frequency, rate or extent of the regulated release of immunoglobulins from a cell. |
| GO:0050729 | | positive regulation of inflammatory response | | Any process that activates or increases the frequency, rate or extent of the inflammatory response. |
| GO:0032729 | | positive regulation of interferon-gamma production | | Any process that activates or increases the frequency, rate, or extent of interferon-gamma production. Interferon-gamma is also known as type II interferon. |
| GO:0032740 | | positive regulation of interleukin-17 production | | Any process that activates or increases the frequency, rate, or extent of production of any member of the interleukin-17 family of cytokines. |
| GO:0048304 | | positive regulation of isotype switching to IgG isotypes | | Any process that activates or increases the frequency, rate or extent of isotype switching to IgG isotypes. |
| GO:0001934 | | positive regulation of protein phosphorylation | | Any process that activates or increases the frequency, rate or extent of addition of phosphate groups to amino acids within a protein. |
| GO:0045591 | | positive regulation of regulatory T cell differentiation | | Any process that activates or increases the frequency, rate or extent of differentiation of regulatory T cells. |
| GO:0034105 | | positive regulation of tissue remodeling | | Any process that activates or increases the frequency, rate, or extent of tissue remodeling. |
| GO:0045944 | | positive regulation of transcription from RNA polymerase II promoter | | Any process that activates or increases the frequency, rate or extent of transcription from an RNA polymerase II promoter. |
| GO:0007205 | | protein kinase C-activating G-protein coupled receptor signaling pathway | | The series of molecular signals generated as a consequence of a G-protein coupled receptor binding to its physiological ligand, where the pathway proceeds with activation of protein kinase C (PKC). PKC is activated by second messengers including diacylglycerol (DAG). |
| GO:0046013 | | regulation of T cell homeostatic proliferation | | Any process that modulates the frequency, rate or extent of resting T cell proliferation. |
| GO:0045471 | | response to ethanol | | Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of an ethanol stimulus. |
cellular component |
| GO:0005829 | | cytosol | | The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes. |
| GO:0005576 | | extracellular region | | The space external to the outermost structure of a cell. For cells without external protective or external encapsulating structures this refers to space outside of the plasma membrane. This term covers the host cell environment outside an intracellular parasite. |
| GO:0005615 | | extracellular space | | That part of a multicellular organism outside the cells proper, usually taken to be outside the plasma membranes, and occupied by fluid. |
Chain B ( IL2RB_HUMAN | P14784)
molecular function |
| GO:0005088 | | Ras guanyl-nucleotide exchange factor activity | | Stimulates the exchange of guanyl nucleotides associated with a GTPase of the Ras superfamily. Under normal cellular physiological conditions, the concentration of GTP is higher than that of GDP, favoring the replacement of GDP by GTP in association with the GTPase. |
| GO:0004896 | | cytokine receptor activity | | Combining with a cytokine and transmitting the signal from one side of the membrane to the other to initiate a change in cell activity. |
| GO:0019976 | | interleukin-2 binding | | Interacting selectively and non-covalently with interleukin-2. |
| GO:0004911 | | interleukin-2 receptor activity | | Combining with interleukin-2 and transmitting the signal from one side of the membrane to the other to initiate a change in cell activity. |
| GO:0005515 | | protein binding | | Interacting selectively and non-covalently with any protein or protein complex (a complex of two or more proteins that may include other nonprotein molecules). |
biological process |
| GO:0000165 | | MAPK cascade | | An intracellular protein kinase cascade containing at least a MAPK, a MAPKK and a MAP3K. The cascade can also contain two additional tiers: the upstream MAP4K and the downstream MAP Kinase-activated kinase (MAPKAPK). The kinases in each tier phosphorylate and activate the kinases in the downstream tier to transmit a signal within a cell. |
| GO:0019221 | | cytokine-mediated signaling pathway | | A series of molecular signals initiated by the binding of a cytokine to a receptor on the surface of a cell, and ending with regulation of a downstream cellular process, e.g. transcription. |
| GO:0038110 | | interleukin-2-mediated signaling pathway | | A series of molecular signals initiated by the binding of interleukin-2 to a receptor on the surface of a cell, and ending with regulation of a downstream cellular process, e.g. transcription. |
| GO:0030101 | | natural killer cell activation | | The change in morphology and behavior of a natural killer cell in response to a cytokine, chemokine, cellular ligand, or soluble factor. |
| GO:0043066 | | negative regulation of apoptotic process | | Any process that stops, prevents, or reduces the frequency, rate or extent of cell death by apoptotic process. |
| GO:0043547 | | positive regulation of GTPase activity | | Any process that activates or increases the activity of a GTPase. |
| GO:0006461 | | protein complex assembly | | The aggregation, arrangement and bonding together of a set of components to form a protein complex. |
| GO:0007165 | | signal transduction | | The cellular process in which a signal is conveyed to trigger a change in the activity or state of a cell. Signal transduction begins with reception of a signal (e.g. a ligand binding to a receptor or receptor activation by a stimulus such as light), or for signal transduction in the absence of ligand, signal-withdrawal or the activity of a constitutively active receptor. Signal transduction ends with regulation of a downstream cellular process, e.g. regulation of transcription or regulation of a metabolic process. Signal transduction covers signaling from receptors located on the surface of the cell and signaling via molecules located within the cell. For signaling between cells, signal transduction is restricted to events at and within the receiving cell. |
| GO:0016032 | | viral process | | A multi-organism process in which a virus is a participant. The other participant is the host. Includes infection of a host cell, replication of the viral genome, and assembly of progeny virus particles. In some cases the viral genetic material may integrate into the host genome and only subsequently, under particular circumstances, 'complete' its life cycle. |
cellular component |
| GO:0009986 | | cell surface | | The external part of the cell wall and/or plasma membrane. |
| GO:0009897 | | external side of plasma membrane | | The leaflet of the plasma membrane that faces away from the cytoplasm and any proteins embedded or anchored in it or attached to its surface. |
| GO:0016021 | | integral component of membrane | | The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane. |
| GO:0005887 | | integral component of plasma membrane | | The component of the plasma membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane. |
| GO:0005622 | | intracellular | | The living contents of a cell; the matter contained within (but not including) the plasma membrane, usually taken to exclude large vacuoles and masses of secretory or ingested material. In eukaryotes it includes the nucleus and cytoplasm. |
| GO:0016020 | | membrane | | A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it. |
| GO:0005886 | | plasma membrane | | The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins. |
Chain C ( IL2RG_HUMAN | P31785)
molecular function |
| GO:0005088 | | Ras guanyl-nucleotide exchange factor activity | | Stimulates the exchange of guanyl nucleotides associated with a GTPase of the Ras superfamily. Under normal cellular physiological conditions, the concentration of GTP is higher than that of GDP, favoring the replacement of GDP by GTP in association with the GTPase. |
| GO:0004896 | | cytokine receptor activity | | Combining with a cytokine and transmitting the signal from one side of the membrane to the other to initiate a change in cell activity. |
| GO:0019976 | | interleukin-2 binding | | Interacting selectively and non-covalently with interleukin-2. |
| GO:0004911 | | interleukin-2 receptor activity | | Combining with interleukin-2 and transmitting the signal from one side of the membrane to the other to initiate a change in cell activity. |
| GO:0004913 | | interleukin-4 receptor activity | | Combining with interleukin-4 and transmitting the signal from one side of the membrane to the other to initiate a change in cell activity. |
| GO:0019982 | | interleukin-7 binding | | Interacting selectively and non-covalently with interleukin-7. |
| GO:0004917 | | interleukin-7 receptor activity | | Combining with interleukin-7 and transmitting the signal from one side of the membrane to the other to initiate a change in cell activity. |
| GO:0005515 | | protein binding | | Interacting selectively and non-covalently with any protein or protein complex (a complex of two or more proteins that may include other nonprotein molecules). |
biological process |
| GO:0000165 | | MAPK cascade | | An intracellular protein kinase cascade containing at least a MAPK, a MAPKK and a MAP3K. The cascade can also contain two additional tiers: the upstream MAP4K and the downstream MAP Kinase-activated kinase (MAPKAPK). The kinases in each tier phosphorylate and activate the kinases in the downstream tier to transmit a signal within a cell. |
| GO:0019221 | | cytokine-mediated signaling pathway | | A series of molecular signals initiated by the binding of a cytokine to a receptor on the surface of a cell, and ending with regulation of a downstream cellular process, e.g. transcription. |
| GO:0006955 | | immune response | | Any immune system process that functions in the calibrated response of an organism to a potential internal or invasive threat. |
| GO:0038110 | | interleukin-2-mediated signaling pathway | | A series of molecular signals initiated by the binding of interleukin-2 to a receptor on the surface of a cell, and ending with regulation of a downstream cellular process, e.g. transcription. |
| GO:0035771 | | interleukin-4-mediated signaling pathway | | A series of molecular signals initiated by the binding of interleukin-4 to a receptor on the surface of a cell, and ending with regulation of a downstream cellular process, e.g. transcription. |
| GO:0038111 | | interleukin-7-mediated signaling pathway | | A series of molecular signals initiated by the binding of interleukin-7 to a receptor on the surface of a cell, and ending with regulation of a downstream cellular process, e.g. transcription. |
| GO:0043547 | | positive regulation of GTPase activity | | Any process that activates or increases the activity of a GTPase. |
| GO:0007165 | | signal transduction | | The cellular process in which a signal is conveyed to trigger a change in the activity or state of a cell. Signal transduction begins with reception of a signal (e.g. a ligand binding to a receptor or receptor activation by a stimulus such as light), or for signal transduction in the absence of ligand, signal-withdrawal or the activity of a constitutively active receptor. Signal transduction ends with regulation of a downstream cellular process, e.g. regulation of transcription or regulation of a metabolic process. Signal transduction covers signaling from receptors located on the surface of the cell and signaling via molecules located within the cell. For signaling between cells, signal transduction is restricted to events at and within the receiving cell. |
| GO:0016032 | | viral process | | A multi-organism process in which a virus is a participant. The other participant is the host. Includes infection of a host cell, replication of the viral genome, and assembly of progeny virus particles. In some cases the viral genetic material may integrate into the host genome and only subsequently, under particular circumstances, 'complete' its life cycle. |
cellular component |
| GO:0009986 | | cell surface | | The external part of the cell wall and/or plasma membrane. |
| GO:0009897 | | external side of plasma membrane | | The leaflet of the plasma membrane that faces away from the cytoplasm and any proteins embedded or anchored in it or attached to its surface. |
| GO:0016021 | | integral component of membrane | | The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane. |
| GO:0005887 | | integral component of plasma membrane | | The component of the plasma membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane. |
| GO:0005622 | | intracellular | | The living contents of a cell; the matter contained within (but not including) the plasma membrane, usually taken to exclude large vacuoles and masses of secretory or ingested material. In eukaryotes it includes the nucleus and cytoplasm. |
| GO:0016020 | | membrane | | A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it. |
| GO:0005886 | | plasma membrane | | The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins. |
Chain D ( IL2RA_HUMAN | P01589)
molecular function |
| GO:0005088 | | Ras guanyl-nucleotide exchange factor activity | | Stimulates the exchange of guanyl nucleotides associated with a GTPase of the Ras superfamily. Under normal cellular physiological conditions, the concentration of GTP is higher than that of GDP, favoring the replacement of GDP by GTP in association with the GTPase. |
| GO:0008144 | | drug binding | | Interacting selectively and non-covalently with a drug, any naturally occurring or synthetic substance, other than a nutrient, that, when administered or applied to an organism, affects the structure or functioning of the organism; in particular, any such substance used in the diagnosis, prevention, or treatment of disease. |
| GO:0019976 | | interleukin-2 binding | | Interacting selectively and non-covalently with interleukin-2. |
| GO:0004911 | | interleukin-2 receptor activity | | Combining with interleukin-2 and transmitting the signal from one side of the membrane to the other to initiate a change in cell activity. |
biological process |
| GO:0000165 | | MAPK cascade | | An intracellular protein kinase cascade containing at least a MAPK, a MAPKK and a MAP3K. The cascade can also contain two additional tiers: the upstream MAP4K and the downstream MAP Kinase-activated kinase (MAPKAPK). The kinases in each tier phosphorylate and activate the kinases in the downstream tier to transmit a signal within a cell. |
| GO:0007219 | | Notch signaling pathway | | A series of molecular signals initiated by the binding of an extracellular ligand to the receptor Notch on the surface of a target cell, and ending with regulation of a downstream cellular process, e.g. transcription. |
| GO:0043029 | | T cell homeostasis | | The process of regulating the proliferation and elimination of T cells such that the total number of T cells within a whole or part of an organism is stable over time in the absence of an outside stimulus. |
| GO:0006924 | | activation-induced cell death of T cells | | A T cell apoptotic process that occurs towards the end of the expansion phase following the initial activation of mature T cells by antigen and is triggered by T cell receptor stimulation and signals transmitted via various surface-expressed members of the TNF receptor family such as Fas ligand, Fas, and TNF and the p55 and p75 TNF receptors. |
| GO:0006915 | | apoptotic process | | A programmed cell death process which begins when a cell receives an internal (e.g. DNA damage) or external signal (e.g. an extracellular death ligand), and proceeds through a series of biochemical events (signaling pathway phase) which trigger an execution phase. The execution phase is the last step of an apoptotic process, and is typically characterized by rounding-up of the cell, retraction of pseudopodes, reduction of cellular volume (pyknosis), chromatin condensation, nuclear fragmentation (karyorrhexis), plasma membrane blebbing and fragmentation of the cell into apoptotic bodies. When the execution phase is completed, the cell has died. |
| GO:0008283 | | cell proliferation | | The multiplication or reproduction of cells, resulting in the expansion of a cell population. |
| GO:0007166 | | cell surface receptor signaling pathway | | A series of molecular signals initiated by activation of a receptor on the surface of a cell. The pathway begins with binding of an extracellular ligand to a cell surface receptor, or for receptors that signal in the absence of a ligand, by ligand-withdrawal or the activity of a constitutively active receptor. The pathway ends with regulation of a downstream cellular process, e.g. transcription. |
| GO:0006955 | | immune response | | Any immune system process that functions in the calibrated response of an organism to a potential internal or invasive threat. |
| GO:0002376 | | immune system process | | Any process involved in the development or functioning of the immune system, an organismal system for calibrated responses to potential internal or invasive threats. |
| GO:0006954 | | inflammatory response | | The immediate defensive reaction (by vertebrate tissue) to infection or injury caused by chemical or physical agents. The process is characterized by local vasodilation, extravasation of plasma into intercellular spaces and accumulation of white blood cells and macrophages. |
| GO:0002437 | | inflammatory response to antigenic stimulus | | An inflammatory response to an antigenic stimulus, which can be include any number of T cell or B cell epitopes. |
| GO:0038110 | | interleukin-2-mediated signaling pathway | | A series of molecular signals initiated by the binding of interleukin-2 to a receptor on the surface of a cell, and ending with regulation of a downstream cellular process, e.g. transcription. |
| GO:0042130 | | negative regulation of T cell proliferation | | Any process that stops, prevents or reduces the rate or extent of T cell proliferation. |
| GO:0050687 | | negative regulation of defense response to virus | | Any process that stops, prevents or reduces the rate or extent of antiviral mechanisms, thereby facilitating viral replication. |
| GO:0050777 | | negative regulation of immune response | | Any process that stops, prevents, or reduces the frequency, rate or extent of the immune response, the immunological reaction of an organism to an immunogenic stimulus. |
| GO:0050728 | | negative regulation of inflammatory response | | Any process that stops, prevents, or reduces the frequency, rate or extent of the inflammatory response. |
| GO:0050672 | | negative regulation of lymphocyte proliferation | | Any process that stops, prevents or reduces the rate or extent of lymphocyte proliferation. |
| GO:0043547 | | positive regulation of GTPase activity | | Any process that activates or increases the activity of a GTPase. |
| GO:0045582 | | positive regulation of T cell differentiation | | Any process that activates or increases the frequency, rate or extent of T cell differentiation. |
| GO:0042102 | | positive regulation of T cell proliferation | | Any process that activates or increases the rate or extent of T cell proliferation. |
| GO:0042104 | | positive regulation of activated T cell proliferation | | Any process that activates or increases the rate or extent of activated T cell proliferation. |
| GO:0046013 | | regulation of T cell homeostatic proliferation | | Any process that modulates the frequency, rate or extent of resting T cell proliferation. |
| GO:0002664 | | regulation of T cell tolerance induction | | Any process that modulates the frequency, rate, or extent of T cell tolerance induction. |
cellular component |
| GO:0009986 | | cell surface | | The external part of the cell wall and/or plasma membrane. |
| GO:0009897 | | external side of plasma membrane | | The leaflet of the plasma membrane that faces away from the cytoplasm and any proteins embedded or anchored in it or attached to its surface. |
| GO:0016021 | | integral component of membrane | | The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane. |
| GO:0005622 | | intracellular | | The living contents of a cell; the matter contained within (but not including) the plasma membrane, usually taken to exclude large vacuoles and masses of secretory or ingested material. In eukaryotes it includes the nucleus and cytoplasm. |
| GO:0016020 | | membrane | | A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it. |
| GO:0005886 | | plasma membrane | | The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins. |
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