title: Fine structure of principal cells in the initial segment of the epididymal duct in the ram.
mesh_terms: D000818:Animals; D003593:Cytoplasm / Q000648:ultrastructure; D004822:Epididymis / Q000648:ultrastructure*; D006056:Golgi Apparatus / Q000648:ultrastructure; D008297:Male; D009940:Organoids / Q000648:ultrastructure; D012756:Sheep / Q000033:anatomy & histology*; D013094:Spermatozoa / Q000648:ultrastructure*