title: Further observations on the embryonic development of ascidians in artificial sea water devoid of sulphate ions.
mesh_terms: D000818:Animals; D002816:Chordata, Nonvertebrate / Q000196:embryology*; D004625:Embryo, Nonmammalian / Q000187:drug effects*; D006025:Glycosaminoglycans; D012623:Seawater; D013431:Sulfates / Q000494:pharmacology*
chemical_list: D006025:Glycosaminoglycans; D013431:Sulfates