Calcium-dependent cell-adhesion protein (By similarity). May play a role in activity-induced synaptic reorganization underlying long term memory (By similarity). Could be involved in CDH2 internalization through TAOK2/p38 MAPK pathway (By similarity). In hippocampal neurons, may play a role in the down-regulation of dendritic spines, maybe through its action on CDH2 endocytosis. The N-terminal extracellular domain forms homophilic interactions; these interactions activate p38 MAPK via TAOK2 and trigger endocytosis. Interacts with CDH2; this interaction may lead to CDH2 cointernalization. Interacts with CDH11. Interacts with TAOK2. Expressed in neuronal cell bodies and dendrites. Localized to excitatory, but not with inhibitory, synapses. Due to intron retention.