[Production of human proteins in the blood of transgenic animals].
The human alpha 1-antitrypsin gene has been microinjected into rabbit embryos. A line of transgenic rabbits has thus been established. Human alpha 1-antitrypsin was found in the blood of transgenic animals at the concentration of 1 mg/ml plasma. The human protein was active and separable from its rabbit counterpart. This experiment demonstrates that it is possible to use blood from transgenic animals as a source of recombinant proteins.