Cytological and histochemical observations on the secretions in the digestive tract of the sipunculan, Phascolopsis gouldii (Pourtales, 1851).
D000818:Animals; D004064:Digestive System / Q000166:cytology / Q000378:metabolism* / Q000648:ultrastructure; D006651:Histocytochemistry; D008854:Microscopy, Electron; D009348:Nematoda / Q000502:physiology*