Gene targeting strategy for B-hNKC mice. The mouse NKC cluster is replaced by human NKC cluster counterparts in B-hNKC mice. The human NKC expression is driven by endogenous human NKC promoter, 5’UTR and 3’UTR. While mouse NKC gene transcription and translation will be disrupted. The mouse NKC cluster contain Klrb1a, Clec2h, Klrb1, Klrb1c, Klrb1b, Clec2i, Clec2g, Clec2f, Klrb1f, Clec2e, Clec2d, Cd69, Clec2m, Clec12a, Clec1b, Clec12b, Clec9a, Clec1a, Clec7a, Olr1, Tmem52b, Gabarapl1, Klre1, Klrd1, Klrk1, Klrc3, Klrc2 and Klrc1. The human NKC cluster contain KLRB1, CLEC2D, CD69, KLRF1, CLEC2B, KLRF2, CLEC2A, CLEC12A, CLEC1B, CLEC12B, CLEC9A, CLEC1A, CLEC7A, OLR1, TMEM52B, GABARAPL1, KLRD1, KLRK1, KLRC4, KLRC3, KLRC2 and KLRC1.