KIR3DL2 and Behcet disease: Some scholars have studied the relationship between BD and KIR3DL1/DS1 gene functional polymorphism, and the results suggested that HLA‐B51 is a risk factor for BD, HLA‐3/11 plays a protective role, Bw4 and Bw4‐80I are risk factors, but with a lower risk than that for B51,47 and the receptor for HLA‐A3 and A11 is KIR3DL2.48