title: Actinomycin D--disruption of the mitotic gradient in the cleavage stages of the sea urchin embryo.
mesh_terms: D000818:Animals; D001757:Blastomeres / Q000166:cytology; D002455:Cell Division; D003609:Dactinomycin / Q000494:pharmacology*; D004625:Embryo, Nonmammalian / Q000166:cytology / Q000187:drug effects*; D008938:Mitosis / Q000187:drug effects*; D012617:Sea Urchins
chemical_list: D003609:Dactinomycin