Study finds a way of freezing and reproducing sperm cells, grown in other species.
A Pennsylvania researcher has discovered a method of freezing spermatogonial stem cells, progenitors of sperm cells, and transferring them into the testes of another animal for growth into sperm cells of the originating species. Kolata G. Study finds a way of freezing and reproducing sperm cells, grown in other species. Researcher Dr. Ralph Brinster of the School of Veterinary Medicine at the University of Pennsylvania.