Running for cover.

The article looks at the possible scientific fraud perpetrated by stem-cell researcher Hwang Woo-suk in South Korea. Hwang, of Seoul National University, made headlines when he published a paper in which he claimed to have derived lines of stem cells from cloned human embryos. Co-author Roh Sung-il claimed Hwang had admitted falsifying data on nine of the 11 stem-cell lines that formed the basis of his findings. Despite being on the list of authors, Roh, who is the head of the MizMedi Women's Hospital, an infertility clinic in Seoul, and who had collaborated with Hwang in the past, said he was not aware of the paper until after it had been published.