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Development, Vol 121, Issue 3 619-628, Copyright © 1995 by Company of Biologists
JOURNAL ARTICLES |
G. Campbell and A. Tomlinson
Much of the cell-cell communication that controls assignment of cell fates during animal development appears to be mediated by extracellular signaling molecules. The formation of the proximodistal (P/D) axis of the legs of flies is controlled by at least two such molecules, a Wnt and a TGFbeta, encoded by the wingless (wg) and decapentaplegic (dpp) genes, respectively. The P/D axis appears to be initiated from the site where cells expressing wg are in close association with those expressing dpp. Support for this hypothesis comes from two sources: classical grafting experiments in cockroaches and ectopic protein expression in Drosophila.
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