Member of the repulsive guidance molecule (RGM) family that contributes to the patterning of the developing nervous system (By similarity). Acts as a bone morphogenetic protein (BMP) coreceptor that potentiates BMP signaling (By similarity). Promotes neuronal adhesion (By similarity). May inhibit neurite outgrowth. . This is the function of Ensembl gene identifier ENSG00000174136 (RGMB, repulsive guidance molecule BMP co-receptor b).