Spermiogenesis in the sea cucumber Holothuria tubulosa.
D000177:Acrosome / Q000648:ultrastructure; D000818:Animals; D002467:Cell Nucleus / Q000648:ultrastructure; D002843:Chromatin; D004247:DNA / Q000032:analysis; D004447:Echinodermata / Q000502:physiology*; D008297:Male; D008854:Microscopy, Electron; D008855:Microscopy, Electron, Scanning; D008928:Mitochondria / Q000648:ultrastructure; D013087:Spermatids / Q000648:ultrastructure; D013091:Spermatogenesis; D013094:Spermatozoa / Q000648:ultrastructure*
D002843:Chromatin; D004247:DNA