跨膜激活剂及钙调亲环素配基相互作用因子(transmembrane activator and calcium-modulator and cyclophilin ligand interactor,TACI)是B细胞激活因子(B cell activating factor belonging to the TNF family,BAFF)信号的一个负向调节受体,对于调节B细胞数量和动态平衡