The function of ENSG00000164050 (PLXNB1, plexin B1) is as follows. Receptor for SEMA4D (PubMed:19843518, PubMed:20877282, PubMed:21912513). Plays a role in GABAergic synapse development (By similarity). Mediates SEMA4A- and SEMA4D-dependent inhibitory synapse development (By similarity). Plays a role in RHOA activation and subsequent changes of the actin cytoskeleton (PubMed:12196628, PubMed:15210733). Plays a role in axon guidance, invasive growth and cell migration (PubMed:12198496). {ECO:0000250|UniProtKB:Q8CJH3, ECO:0000269|PubMed:12196628, ECO:0000269|PubMed:12198496, ECO:0000269|PubMed:15210733, ECO:0000269|PubMed:19843518, ECO:0000269|PubMed:20877282, ECO:0000269|PubMed:21912513}.