title: Giant barnacle and Peripatus muscles: striated--smooth transitions.
mesh_terms: D000818:Animals; D001181:Arthropods / Q000033:anatomy & histology*; D003445:Crustacea / Q000033:anatomy & histology*; D009119:Muscle Contraction; D009130:Muscle, Smooth / Q000648:ultrastructure; D009132:Muscles / Q000502:physiology / Q000648:ultrastructure*