1LI1 | A:2-114; A:115-229; F:4-114; F:115-229; B:3-114; B:115-229; C:5-114; C:115-229; D:2-114; D:115-229; E:3-114; E:115-229 | THE 1.9-A CRYSTAL STRUCTURE OF THE NONCOLLAGENOUS (NC1) DOMAIN OF HUMAN PLACENTA COLLAGEN IV SHOWS STABILIZATION VIA A NOVEL TYPE OF COVALENT MET-LYS CROSS-LINK |