Whose eggs?

This article reports that the ethical concerns of a different kind are jeopardising plans for a World Stem Cell Hub to share lines of human embryonic stem cells (ESCs). Plans for the hub were unveiled last month by Woo Suk Hwang of Seoul National University in South Korea, who shot to fame through his work on deriving human ESCs from cloned embryos. Hwang rejected the accusation. But now his main U.S. collaborator, Gerald Schatten of the University of Pittsburgh, says he will no longer work with Hwang, after reviewing new evidence on the source of the eggs.