Semaphorins: repulsive guidance molecules show their attractive side
Andreas W. Püschel
Andreas Püschel is at the Max-Planck Institute
for Brain Research, Department of Neurochemistry, Deutschordenstrasse
46, Frankfurt 60528, Germany. pueschel@mpih-frankfurt.mpg.de
Semaphorins are known to repel growth cones of developing axons, but a
study of the grasshopper limb bud shows that they can also serve as attractive
guidance cues.
