title: Letter: Troponin subunit interactions.
mesh_terms: D001665:Binding Sites; D002118:Calcium; D008854:Microscopy, Electron; D008961:Models, Structural; D009124:Muscle Proteins / Q000032:analysis*; D011485:Protein Binding; D014335:Tropomyosin / Q000032:analysis*
chemical_list: D009124:Muscle Proteins; D014335:Tropomyosin; D002118:Calcium