1. Braverman, M. H.: Regional specificity of inhibition within the chick brain. J. Morph.108, 263?285 (1961).
2. DeHaan, R. L.: Organization of the cardiac plate in the early chick embryo. Acta Embryol. Morph. exp. (Palermo)6, 26?30 (1963).
3. Dial, N. A.: Inhibitory control of neural differentiation in explants ofRana pipiens gastrula ectoderm. J. Morph.108, 311?326 (1961).
4. Eyal-Giladi, H.: Dynamic aspects of neural induction in amphibia. Arch. Biol. (Liège)65, 179?259 (1954).
5. Goettert, L.: Differenzierungsleistungen von explantiertem Urodelenektoderm (Ambystoma mexicanum Cope undTriturus alpestris Laur) nach verschieden langer Unterlagerungszeit. Wilhelm Roux' Arch. Entwickl.-Mech. Org.157, 75?100 (1966).