title: Ultrastructural characteristics of monkey spermatogonia and preleptotene spermatocytes.
mesh_terms: D000818:Animals; D000882:Haplorhini / Q000033:anatomy & histology*; D008251:Macaca / Q000033:anatomy & histology; D008253:Macaca mulatta / Q000033:anatomy & histology; D008297:Male; D008540:Meiosis; D008854:Microscopy, Electron; D013090:Spermatocytes / Q000648:ultrastructure*; D013093:Spermatogonia / Q000648:ultrastructure*; D013094:Spermatozoa / Q000648:ultrastructure*