It is involved in synaptogenesis and promotes synapse differentiation (By similarity). Suppresses neurite outgrowth (PubMed:14550773). Interacts (via LRR 1 and 2 repeats) with PTPRD (via extracellular domain). In the adult, significant expression is detected only in the brain. Broadly expressed in embryonic brain with highest expression in subventricular zone, subplate, cortical plate, pyramidal cell layer of hippocampus, thalamus and hypothalamus. In the embryo, expressed from day 10-12 and continues through later gestational development and into adulthood. Belongs to the SLITRK family.