We identified ten NK subgroup-specific marker molecules (Kcnj8, Cmah, Ccnd2, Cx3cr1, Thy1, Tnfrsf9, Zbtb20, Gng11, CD226, Egr3) from C0 to C9 and assessed their expression changes during infection using RT-qPCR. The gene discussed is CCND2; the disease is infection.