mRNA levels of BAFF receptors in BALL-1, Hmy2.CIR and U937 cells assessed by real-time PCR. The mRNA levels were normalized with GAPDH. BALL-R relative expression levels in BALL-1, Hmy2.CIR and U937 cells were respectively 0.7, 1.0, and 0/undetectable, P<0.05; TACI relative expression levels were respectively 0.07, 0.9 and 0/undetectable, P<0.05; BCMA relative expression levels were respectively 0, 0.75 and 0/undetectable, P<0.05.