Stem cell scientist Hwang Woo-suk arrives for his trial at a court in Seoul June 19, 2007. Hwang, once celebrated as a national hero after raising hopes that his work could one day lead to cures for such illnesses as diabetes and spinal cord injuries, was indicted in May last year on charges of fraud and embezzlement related to his research. REUTERS/Jo Yong-Hak (SOUTH KOREA)