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Science 21 April 2006:
Vol. 312. no. 5772, p. 349
DOI: 10.1126/science.312.5772.349a
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News of the Week

DEVELOPMENT:
Gene-Suppressing Proteins Reveal Secrets of Stem Cells

Constance Holden

According to papers in Cell and Nature this week, molecules called polycomb group proteins are key guardians of "stemness," the ability of embryonic stem cells to replicate indefinitely and retain the potential to turn into any kind of body cell. (Read more.)

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Science. ISSN 0036-8075 (print), 1095-9203 (online)