Probable cell surface receptor that regulates oligodendroglial precursor cell migration (By similarity). Might also regulate differentiation of oligodendroglial precursor cells (PubMed:21945643). Has growth cone collapse activity against retinal ganglion-cell axons (PubMed:10051670). Interacts (via PDZ-binding motif) with DLG4/SAP90 (via PDZ domain 2); this interaction may promote translocation of DLG4/SAP90 to the membrane. Colocalizes with DLG4 at synapses. Expressed at low levels in the developing embryo (PubMed:10051670). Expressed at high levels in the lung and adult central nervous system, including the dorsal root ganglia (PubMed:10051670). Belongs to the semaphorin family.