South Korean stem-cell scientist Hwang Woo-suk (L) leaves with his students as a supporter of his holds up a poster after a news conference in Seoul January 12, 2006. Hwang apologised on Thursday for wrongdoing at his laboratory, but said his team may have been the victim of a conspiracy trying to discredit them. Underscoring Hwang's fall, prosecutors raided his home and offices on Thursday as part of a criminal probe into the alleged misuse of state funds, South Korean media reported. REUTERS/You Sung-Ho