The KLRB1F/CD161f protein is thought to bind CLEC2I/Clr-g, activate natural killer cells and provide costimulation for IL-2 production and T cell proliferation. This dual function highlights its critical role in coordinating immune responses. KLRB1F/CD161f Protein, Mouse (HEK293, Fc) is the recombinant mouse-derived KLRB1F/CD161f protein, expressed by HEK293 , with N-hFc labeled tag.