title: Fine structure and innervation of an annelid muscle with the longest recorded sarcomere.
mesh_terms: D000818:Animals; D000845:Annelida / Q000166:cytology*; D004847:Epithelial Cells; D008274:Magnesium / Q000032:analysis; D008853:Microscopy; D008854:Microscopy, Electron; D008855:Microscopy, Electron, Scanning; D009132:Muscles / Q000166:cytology* / Q000294:innervation; D011531:Proventriculus / Q000166:cytology; D012519:Sarcoplasmic Reticulum
chemical_list: D008274:Magnesium