KLRK1 and neoplasm: FM‐DEL1 and FM‐DEL2 were screened against a series of tumor‐associated antigens (i.e., PSMA, ACP3, and CAIX), an immunological NK‐cell target (i.e., NKG2D), and closely related proteins (“anti‐targets”).[7] All targets and anti‐targets were produced as purified recombinant proteins by transient gene expression in CHO cells.