title: A change in the twist of the actin-containing filaments occurs during the extension of the acrosomal process in Limulus sperm.
mesh_terms: D000177:Acrosome / Q000648:ultrastructure*; D000199:Actins; D000818:Animals; D005614:Freeze Fracturing; D006737:Horseshoe Crabs / Q000502:physiology*; D008297:Male; D008854:Microscopy, Electron; D011487:Protein Conformation; D013094:Spermatozoa / Q000648:ultrastructure*
chemical_list: D000199:Actins