Fig. 5. Axon lengths of hippocampal neurons are not altered by reelin treatment or by reduction in Crk levels. Tau-positive axons lengths were measured in hippocampal neurons 3 days after viral infection and 1 day after replating in the presence of reelin CM, control CM or neurobasal/B-27 media. Reelin CM treatment did not significantly alter process lengths under these conditions. Similarly, infection of neurons with the Crk&CrkL shRNA virus had no effect on the extension of axons in hippocampal neurons. The number of neurons measured is indicated at the base of each bar.