KLRC2 and cytomegalovirus infection: Indeed, NK cells arising from this precursor were capable of controlling CMV infection and displayed a mature KIR+NKG2C+CD57+ phenotype [22] that recalls the traits of CMV‐driven NK cell expansions, characterized by memory‐like properties, often referred to as “adaptive NK cells” [23] (see section “NK cell specialization: the “adaptive “ NK cells”).