May play a role in cell-cell or cell-ligand interactions during synaptogenesis and other events in the brain. Forebrain, cerebellum and tectum. It is detected at embryonic day 4 (E4) in forebrain and tectum. There is an increase in levels between E16 and the first few days post-hatch. During E19 to hatch a rapid reduction in the levels is seen with a general increase in expression in adulthood. The N-terminus is blocked.