UNDERSTANDING THE ROLE OF LEU22 VARIANTS IN METHOTREXATE RESISTANCE: COMPARISON OF WILD-TYPE AND LEU22ARG VARIANT MOUSE AND HUMAN DIHYDROFOLATE REDUCTASE
NEW INSIGHTS INTO DHFR INTERACTIONS: ANALYSIS OF PNEUMOCYSTIS CARINII AND MOUSE DHFR COMPLEXES WITH NADPH AND TWO HIGHLY POTENT TRIMETHOPRIM DERIVATIVES