Marie CseteThe chief scientific officer at California's stem-cell agency has announced that she will step down from her position in a little over a month.Marie Csete, who had been at the San Francisco-based California Institute for Regenerative Medicine (CIRM) for slightly more than a year, has so far offered no specific reasons for leaving the agency, which was created to fund stem-cell research through Proposition 71. Csete was highly respected in the medical-science community, and news of her