title: X-ray diffraction studies of the heart.
mesh_terms: D000199:Actins; D003094:Collagen; D003599:Cytoskeleton / Q000648:ultrastructure; D003971:Diastole; D009200:Myocardial Contraction; D009206:Myocardium / Q000648:ultrastructure*; D009218:Myosins; D010507:Periodicity; D011487:Protein Conformation; D013599:Systole; D014961:X-Ray Diffraction / Q000379:methods
chemical_list: D000199:Actins; D003094:Collagen; D009218:Myosins