title: Reversible morphological changes in the contractile sphere of crayfish muscle fibers.
mesh_terms: D000818:Animals; D003400:Astacoidea; D002118:Calcium / Q000378:metabolism / Q000502:physiology; D008854:Microscopy, Electron; D009119:Muscle Contraction; D009132:Muscles / Q000166:cytology / Q000378:metabolism / Q000502:physiology*
chemical_list: D002118:Calcium