Cell surface receptor for PLXNB2 that plays an important role in cell-cell signaling. PLXNB2 binding promotes downstream activation of RHOA and phosphorylation of ERBB2 at 'Tyr-1248'. Required for normal brain development, axon guidance and cell migration. Probable signaling receptor which may play a role in myogenic differentiation through activation of the stress-activated MAPK cascade. Interacts (via the PDZ-binding motif) with GIPC (via the PDZ domain). Interacts with NCDN. Interacts (via the PDZ-binding motif) with DLG4. Interacts with PLXNB2. Predominantly expressed in brain (at protein level). First detected at 14 dpc, levels increase by birth and remain strong in the adult brain (at protein level). Expressed widely in the nervous tissues during development. Up-regulated in differentiating myoblasts and upon muscle regeneration (at protein level). Partial neonate lethality, due to defects in brain and neural tube development. In about one third of the embryos cranial neural folds fail to converge, leading to an open neural tube and exencephaly. Mice without exencephaly are viable and fertile. Belongs to the semaphorin family.