title: Onto-phylogenetic aspects of muscle fibre types in the segmental trunk muscle of lower chordates.
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D002816:Chordata, Nonvertebrate / Q000033:anatomy & histology*; D008854:Microscopy, Electron; D024510:Muscle Development; D009132:Muscles / Q000648:ultrastructure*