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First published online April 27, 2005
doi: 10.1242/10.1242/dev.01830
Review |

1 Department of Biological Sciences, Stanford University, 371 Serra Mall,
Stanford, California 94305, USA
2 Genentech Incorporated, 1 DNA Way, South San Francisco, California 94080,
USA
Author for correspondence (e-mail:
marctl{at}stanford.edu)
SUMMARY
During embryonic development, morphogens act as graded positional cues to dictate cell fate specification and tissue patterning. Recent findings indicate that morphogen gradients also serve to guide axonal pathfinding during development of the nervous system. These findings challenge our previous notions about morphogens and axon guidance molecules, and suggest that these proteins, rather than having sharply divergent functions, act more globally to provide graded positional information that can be interpreted by responding cells either to specify cell fate or to direct axonal pathfinding. This review presents the roles identified for members of three prominent morphogen families the Hedgehog, Wnt and TGFß/BMP families in axon guidance, and discusses potential implications for the molecular mechanisms underlying their guidance functions.
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