TO GO WITH AFP STORY BY MARIETTE LE ROUX (FILES) This file photo released on February 24, 1998 in London shows Mr Jefferson, a cloned calf produced by the team which produced Dolly the cloned sheep, standing in his stall at the Virginia and Maryland Regional College of Veterinary Sciences in Blacksburg. When Dolly the cloned sheep was born 20 years ago on July 5, many hailed mankind's new-found mastery over DNA as a harbinger of medical miracles such as lab-grown transplant organs. Others trembled at the portent of a "Brave New World" of identical humans farmed for spare parts or as cannon fodder. As it turns out, neither came to pass. / AFP PHOTO / STRSTR/AFP/Getty Images
