title: Pellucid marginal corneal degeneration: a clinicopathologic study of two cases.
mesh_terms: D000368:Aged; D003315:Cornea / Q000201:enzymology / Q000648:ultrastructure; D003316:Corneal Diseases / Q000201:enzymology / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male; D003012:Microbial Collagenase / Q000378:metabolism; D008854:Microscopy, Electron; D008875:Middle Aged
chemical_list: D003012:Microbial Collagenase