Transmission problem in primary induction.
D000818:Animals; D001921:Brain / Q000196:embryology; D002454:Cell Differentiation; D002490:Central Nervous System / Q000196:embryology*; D004475:Ectoderm / Q000166:cytology; D004627:Embryonic Induction; D007365:Intercellular Junctions / Q000502:physiology; D008648:Mesoderm / Q000166:cytology; D013116:Spinal Cord / Q000196:embryology; D014319:Triturus / Q000196:embryology*