[Preliminary cytochemical studies during sea urchin (Paracentrotus lividus) spermatogenesis].
D000818:Animals; D006651:Histocytochemistry; D008297:Male; D008854:Microscopy, Electron; D012617:Sea Urchins / Q000502:physiology*; D013091:Spermatogenesis; D013737:Testis / Q000648:ultrastructure