Cell surface receptor for PLXNB1, PLXNB2, PLXNB3 and PLXND1 that plays an important role in cell-cell signaling (PubMed:20043131, PubMed:17318185). Regulates glutamatergic and GABAergic synapse development (PubMed:29981480). Promotes the development of inhibitory synapses in a PLXNB1-dependent manner and promotes the development of excitatory synapses in a PLXNB2-dependent manner (PubMed:29981480). Plays a role in priming antigen-specific T-cells, promotes differentiation of Th1 T-helper cells, and thereby contributes to adaptive immunity (PubMed:15780988). Promotes phosphorylation of TIMD2 (PubMed:12374982). Inhibits angiogenesis (PubMed:17318185). Promotes axon growth cone collapse (PubMed:20043131). Inhibits axonal extension by providing local signals to specify territories inaccessible for growing axons (PubMed:20043131). Interacts with PLXNB1, PLXNB2 and PLXNB3 (PubMed:20043131). Interacts with PLXND1 (PubMed:17318185). Interacts with TIMD2 (PubMed:12374982). Expressed in neurons and glia in the developing hippocampus. Expressed from day 10 in the embryo. Low levels found between days 10-12. Expression peaks on day 13 with moderate levels from then until birth. Results are contradictory; one study (PubMed:15780988) finds no visible phenotype; mice are born at the expected Mendelian ratio and are fertile, but they present defects in T-cell differentiation and in T-cell responses to antigens. According to another publication (PubMed:15277503) gene disruption leads to degeneration of photoreceptor cells in the retina within the first month of life. Belongs to the semaphorin family.