The Growing Conflict Over Producing Stem Cells

Some researchers laud the therapeutic potential of a 'biological jack-of-all trades'; others object to the use of leftover embryos

One of the thorniest issues in bioethics lately -- the propriety of research on cells from fetuses and embryos that can give rise to a variety of human tissues -- may be about to become more contentious.

The American Association for the Advancement of Science last month released a draft report on the issue that differs in a key aspect from

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