title: X-ray diffraction study of contracting heart muscle.
mesh_terms: D000818:Animals; D004285:Dogs; D066298:In Vitro Techniques; D009200:Myocardial Contraction; D009218:Myosins; D010210:Papillary Muscles / Q000502:physiology*; D012298:Rigor Mortis; D014961:X-Ray Diffraction
chemical_list: D009218:Myosins