title: Ultrastructural studies of intrinsic muscle contracture.
mesh_terms: D000293:Adolescent; D000328:Adult; D003094:Collagen / Q000096:biosynthesis; D006801:Humans; D008875:Middle Aged; D009119:Muscle Contraction; D009132:Muscles / Q000502:physiology / Q000648:ultrastructure*; D009210:Myofibrils / Q000648:ultrastructure
chemical_list: D003094:Collagen