 In 2001, he was also the first to clone an endangered species (a Gaur), and in 2003, he cloned an endangered wild ox (a Banteng) from the frozen skin cells of an animal that had died at the San Diego Zoo nearly a quarter-of-a-century earlier.Lanza and his colleagues were the first to demonstrate that nuclear transplantation could be used to reverse the aging process and to generate immune-compatible tissues, including the first organ grown in the laboratory from cloned cells.Lanza showed that it is feasible to generate functional oxygen-carrying red blood cells from human embryonic stem cells under conditions suitable for clinical scale-up.