The periodicity of collagen in the brain sheath of a polychaete.
D000818:Animals; D000845:Annelida / Q000033:anatomy & histology*; D005075:Biological Evolution; D001921:Brain / Q000033:anatomy & histology; D003094:Collagen; D003238:Connective Tissue; D008854:Microscopy, Electron
D003094:Collagen