Abstract
Inhibitory killer cell immunoglobulin-like receptors (iKIR) tolerize natural killer cells and some T cells upon detecting classical HLA class I molecules. In this issue, Bhatt and colleagues identify the B7 family member HHLA2 as an unanticipated ligand for a peculiar iKIR family member, KIR3DL3. These data establish a new inhibitory checkpoint pathway that may protect HHLA2+ tumor cells from immune attack.See article by Bhatt et al., p. 156.
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