[Activities of protein synthesis during the development of lethal nucleocytoplasmic hybrids obtained by nuclear graft between Ambystoma mexicanum Shaw and Ambystoma dumerilii Duges (Amphibia, Urodeles)].

A comparative study of proteinograms and zymograms (LDH, MDH) has been carried out at different ontogenic stages, in Ambystoma mexicanum (A.m.), Ambystoma dumerilii (A.d.) and nucleocytoplasmic hybrids 2 n A.d/cytoplasm Am. It appears that 2 n A.d. nucleus, grafted in A.m. cytoplasm expresses only a part of its potentialities, which could account for lethality of the nucleocytoplasmic hybrids.