Scientists have pushed the limits of mammal cloning until the whole house of cards has come tumbling down. After two decades of continuous work, researchers in Japan have discovered a genetic 'dead end' to mammal cloning. The study began in 2005, when researchers, led by scientists at the University of Yamanashi in Japan, cloned a single female mouse. They then re-cloned that clone by transferring its nuclear DNA into an egg 'emptied' of nuclear DNA, and so on and so forth, for 57 more

Tag-uri: DNA