Knowing How to Navigate: Mechanisms of Semaphorin Signaling in the Nervous System

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Science's STKE  12 Feb 2002:
Vol. 2002, Issue 119, pp. re1
DOI: 10.1126/stke.2002.119.re1

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The nervous system is made of billions of neurons that are interconnected with astonishing precision. The reductionistic approach toward understanding this process of brain wiring is to understand how the navigation of individual axons and dendrites is determined. A key finding to emerge is that extracellular cues play decisive roles in establishing these connections. This review uses the semaphorin proteins, which were first identified as repellents for navigating axons, as an example to illustrate the principles we have learned in the molecular mechanisms of axon guidance and other processes of neuronal development.