Cell adhesion molecule that plays a role in neuronal self-avoidance. Promotes repulsion between specific neuronal processes of either the same cell or the same subtype of cells. Promotes both isoneuronal self-avoidance for creating an orderly neurite arborization in retinal rod bipolar cells and heteroneuronal self-avoidance to maintain mosaic spacing between AII amacrine cells (PubMed:19945391). Adhesion molecule that promotes lamina-specific synaptic connections in the retina: expressed in specific subsets of interneurons and retinal ganglion cells (RGCs) and promotes synaptic connectivity via homophilic interactions (By similarity). Homodimer; mediates homophilic interactions to promote cell adhesion. In the retina, expressed in the rod photoreceptors, AII amacrine cells and rod bipolar cells (at protein level). The inner nuclear and inner plexiform layers in the retina are disorganised at postnatal day 20 (P20). AII amacrine cell populations are randomly distributed or pulled into clumps and rod bipolar show fasciculated dendrites.