[Evolution of xenografts of embryonic gonads and juvenile ovaries from Ambystoma mexicanum Shaw, transplanted into Triturus alpestris Laur].

Gonad primordium of Ambystoma mexicanum when grafted at tail-bud stage on Triturus alpestris is indefinately tolerated. Testis or ovaries derived from those grafted embryonic gonads follow their differentiaion and reach sexual maturity. Axolotl juvenile ovaries transplanted in Triturus alpestris are also tolerated; the ovocytes achieve the entire vitellogenesis but are not able to be laid.