Patent 7259291 was granted and assigned to Viragen on August, 2007 by the United States Patent and Trademark Office.
A method of enucleating an egg by exposing the egg to gamma irradiation. The dose of gamma irradiation used is sufficiently high to halt development of the egg or embryo derived therefrom directed by the nucleus of the irradiated egg, but sufficiently low to enable development of the egg or embryo directed by a nucleus transferred into the enucleated egg.