Another Korean has been found guilty of stem cell fraud -- but this time before his paper had been published. Jong-hyuk Park, a co- author of Hwang Woo-suk's cloning papers, deliberately falsified images in an unpublished manuscript which he was preparing for the journal Nature while working as a postdoc at the University of Pittsburgh. He also attempted to destroy evidence of his misconduct. His paper claimed that he had developed embryonic stem cell lines in Rhesus monkeys. Park has been barred from applying for or receiving federal grants, contracts or loans for three years.