Clonal stable CHO cell line constitutively expressing full length human BCMA protein (also known as CD269 or TNFRSF17, Genbank accession #NM_001192) and human CD20 protein (also known as MS4A1 or FMC7, Genbank accession #NM_021950). This cell line was derived from our CHO-K1 Luciferase cells (BPS Bioscience, #79725), therefore it also constitutively expresses the firefly luciferase reporter. Surface expressions of BCMA and CD20 were confirmed by flow cytometry.