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Phase-contrast and psuedocolor images depicting the higher density of F-actin in the P-domain regions of growth cones that are closer to a micropipette releasing an attractive guidance cue. Upper panel shows a chick dorsal root ganglion growth cone exposed to nerve growth factor, and lower panel shows a chick retinal growth cone exposed to netrin. With permission from Marsick et al., (2010) Dev. Neurobiol. 70, 565-588.
