title: Effect of the potassium ion on induction of notochord from gastrula ectoderm of Rana pipiens.
mesh_terms: D000818:Animals; D001001:Anura; D004475:Ectoderm / Q000187:drug effects*; D011188:Potassium / Q000494:pharmacology*; D011894:Rana pipiens / Q000196:embryology*
chemical_list: D011188:Potassium