Ortantly, these defects in self-avoidance are specific to this Dscam-positive population of cells because other amacrine cell populations develop their normal mosaic spacing within the retina. This indicates that, similar to Drosophila Dscam1, vertebrate Dscam is required for iso-neuronal self-avoidance.NIH-PA Author Manuscript NIH-PA Author Manuscript NIH-PA Author ManuscriptAnnu Rev Neurosci. Au