DLBCL tumor cells express BCMA/TACI signaling receptor and proteoglycan coreceptor. RT-PCR analysis of TACI, BCMA, and APRIL mRNA expression in DLBCL cell lines. (B) Specificity of the anti-TACI and BCMA mAbs is shown on transfected 293T cells. (C) APRIL-R expression analysis by flow cytometry. Control stainings (isotype control and acrpCTRL) are shown as dotted lines. Heparin and BCMA-COMP were used at 1/100 and 50 μg/mL, respectively. SUDHL-4 and -7 harbored identical staining to OCI-Ly7. OCI-Ly10 harbored an identical staining to OCI-Ly3.