Two University of Minnesota ethicists have set off a firestorm by raising questions about a controversial Texas stem-cell company.

In February, Leigh Turner, an associate professor at the University of Minnesota's Center for Bioethics, asked the Food and Drug Administration to investigate the company, Celltex Therapeutics, for selling stem-cell treatments that have not been proved safe or effective. That same month, his colleague Carl Elliott wrote an online article questioning the ethics of the company's own ethicist.

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