CD161 was highly expressed in human erythroleukemia cell line HEL, chronic myeloid leukemia (CML)-derived cell line HAP1, human placental choriocarcinoma cell line BeWo, human plasmacytoma cell line Karpas-707, glioblastoma cell line U-138 MG, human hematopoietic cell line U-937 and other cell lines (Figure 1D). Here, KLRB1 is linked to plasmacytoma.