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Turmoil at California Stem Cell Institute

This month has been tumultuous for the California Institute for Regenerative Medicine. Marie Csete, the $3 billion operation's chief scientific officer, has resigned after little more than a year, reports Consumer Watchdog.

Csete, who came to CIRM in March 2008, will leave at the end of July. Her brief letter to the board offers no explanation or indication of future plans.

Csete's announcement comes less than 2 weeks after board chairman Robert Klein told the board that he will be leaving next year at the end of his 6-year term. The move was unexpected because Klein had previously indicated that he was there for the long haul.