In particular, on tumor cells, NCRs may recognize intracellularly localized proteins, such as BAT3/BAG6 and PCNA [29,30,31], that may be expressed at the cell surface of stressed or cancer cells, or cell surface molecules, such as B7-H6 and 21spe-MLL5 [32,33]. Here, NCR3LG1 is linked to neoplasm.