Debate Rages Over Animal-Human Chimeras

Should med­ical researchers be allowed to cre­ate human-ani­mal hybrids to inves­ti­gate dis­ease? No, says an ethics think tank that advis­es the Scot­tish Par­lia­ment. Yes, says Ian Wilmut of the Uni­ver­si­ty of Edin­burgh, cre­ator of Dol­ly the cloned sheep.