176 2003o-368 aspectpolitique cellulessouches children'sfiction cloning cloninginfiction embryonhumain embryoresearch ethics fiction humancloning humanembryo juvenilefiction largetypebooks newberyhonor newyorktimesreviewed nouvelles organism politicalaspects publicpolicy qs620m217w2003 recherche research romans sciencefiction stemcells unitedstates youngadultfiction états-unis