title: Ultrastructural features of crayfish phasic and tonic muscle fibers.
mesh_terms: D000818:Animals; D003445:Crustacea / Q000033:anatomy & histology*; D008854:Microscopy, Electron; D009210:Myofibrils / Q000033:anatomy & histology*; D009469:Neuromuscular Junction / Q000033:anatomy & histology*