title: Accumulation of procollagen in human floppy mitral valves.
mesh_terms: D006801:Humans; D008943:Mitral Valve / Q000378:metabolism*; D008945:Mitral Valve Prolapse / Q000209:etiology / Q000378:metabolism*; D011347:Procollagen / Q000378:metabolism*
chemical_list: D011347:Procollagen