title: Ultrastructural and histochemical study of the glands of the proboscis in Bonellia viridis rolando (Echiura).
mesh_terms: D000818:Animals; D000845:Annelida / Q000648:ultrastructure*; D004817:Epidermis / Q000648:ultrastructure*; D005088:Exocrine Glands / Q000032:analysis / Q000648:ultrastructure*; D006651:Histocytochemistry; D009093:Mucus / Q000032:analysis