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Science 313 (5783): 50-51

Copyright © 2006 by the American Association for the Advancement of Science

Morphing into Shape

David L. Stern

Two appendages of the fly, the haltere and the wing, grow to very different sizes. Limited expression and mobility of a growth morphogen is partly responsible for this difference.

The author is in the Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, USA. E-mail: dstern{at}

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Science Signaling. ISSN 1937-9145 (online), 1945-0877 (print). Pre-2008: Science's STKE. ISSN 1525-8882