The author is at the Mental Retardation Research Center, Department of Psychiatry and Biobehavioral Sciences, University of California Los Angeles Los Angeles, California 90095, USA. scohenco@ucla.edu
Netrin-1 initially attracts and later repels retinal axons. A new paper shows that both intrinsic and extrinsic cues are involved in regulating this developmental switch in responsiveness.
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