Receptor for TNFSF13B/BLyS/BAFF and TNFSF13/APRIL. Promotes B-cell survival and plays a role in the regulation of humoral immunity. Activates NF-kappa-B and JNK (By similarity). Associates with TRAF1, TRAF2, TRAF3, TRAF5 and TRAF6. Detected in spleen, thymus, bone marrow and heart, and at lower levels in kidney and lung.