B-cell receptor specific for TNFSF13B/TALL1/BAFF/BLyS. Promotes the survival of mature B-cells and the B-cell response. Highly expressed in spleen and testis; detected at lower levels in lung and thymus. Defects in Tnfrsf13c are a cause of severe B-cell deficiency. B-cell deficient strain A/WySnJ has a 4.7 kb insertion in the BAFFR gene leading to an altered C-terminus. The mutant RNA is not detectable. B-cell lymphopoiesis is normal, but the life span of peripheral B-cells is much reduced.