Advances in interspecific pregnancy

Interspecific pregnancy in which the conceptus and female carrying the preg nancy are of different species is a key step to interspecific cloning. Clon ing endangered animals by interspecific pregnancy is such a highlight catch ing people's eyes nowadays. In this article, the history of interspecific p regnancy, the methods for establishment of interspecific pregnancy, the cor responding theories, barriers and applied prospects are reviewed.