Everything seemed so bright for pioneering South Korean stem cell scientist Hwang Woo-suk just a few weeks ago after two major breakthroughs this year. Now the man who made world headlines by cloning a dog faces a swirl of allegations over the ethics of his team's work. The Seoul National University scientist is a hero in South Korea, where postage stamps have been commissioned depicting the hopes of his research, a man rising from a wheelchair and walking. Foreign researchers, especially those from the United States where there are federal funding restrictions on stem cell research, have been knocking on Hwang's door.