Stanford University is to tell its researchers that around one-quarter of the human embryonic stem-cell lines eligible for US government funding are now off-limits because of ethics concerns. The institute, in Palo Alto, California, is concerned that some of the women who donated the embryos for these stem-cell lines did not give informed consent for the lines to be used in research. Johns Hopkins University in Baltimore, Maryland, has decided to reconsider lines individually as researchers express an interest in using them.
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