title: Ultrastructural and cytochemical aspects of spermiogenesis in Hydra hymanae, with reference to factors involved in sperm head shaping.
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D002467:Cell Nucleus / Q000648:ultrastructure; D006657:Histones / Q000378:metabolism; D006829:Hydra / Q000166:cytology*; D008297:Male; D008854:Microscopy, Electron; D008870:Microtubules / Q000648:ultrastructure; D009940:Organoids / Q000648:ultrastructure; D013077:Sperm Head / Q000648:ultrastructure*; D013090:Spermatocytes / Q000166:cytology; D013091:Spermatogenesis; D013093:Spermatogonia / Q000166:cytology; D013094:Spermatozoa / Q000166:cytology* / Q000648:ultrastructure*
chemical_list: D006657:Histones