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Science 2 May 2003:
Vol. 300. no. 5620, p. 722
DOI: 10.1126/science.300.5620.722
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News of the Week

DEVELOPMENTAL BIOLOGY:
Purified Signaling Protein Stimulates Stem Cell Proliferation

Jennifer Couzin

After decades of painstaking and often fruitless effort, a team of scientists has purified a versatile protein that stars in multiple cell dramas, from embryonic development to cancer. The protein, called Wnt, turns out to have yet another role: making stem cells multiply.

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