In parallel, we assessed the expression levels of NCR2-ligands by staining different tumor cell lines with a NCR2/NKp44-Fc molecule and detected significant ligand expression on several tumor lines (MDA-MB-435, HeLa, and DU-145; Figure S1 in Supplementary Material) while the colon carcinoma line Colo205 showed no significant staining. Here, NCR2 is linked to neoplasm.