BAFF: B cell activating factor belonging to TNF superfamily BAFF-R: BAFF receptor BCMA: B cell maturation antigen FCS: fetal calf serum FCM: flow cytometry FITC: fluorescein isothiocyanate HCMV: human cytomegalovirus HFL-1: human embryonic lung fibroblast-1 ODN: oligodeoxynucleotide LD50: half letha