Abstract
It was first demonstrated only a few years ago that some brain cells continue to divide and mature in adults, and now scientists have shown that these cells even exist in the brains of dead adults. Researchers at the Salk Institute, Stanford University, and Childrens Hospital in Orange County isolated immature progenitor cells from cadavers (up to 20 hours postmortem), as well as brain surgery patients. These cells keep dividing in culture for over six months and can mature into both neurons and astrocytes. By comparison to stem cells isolated from fetal tissues, however, these samples had a more limited lifespan and range of differentiation. The paper appears in the May 3 issue of Nature. L.O.
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