KIR3DL1 and Behcet disease: Conversely, an analysis at the allele level of KIR3DL1/S1 revealed that the combination of low-expressing KIR3DL1/S1 alleles with KIR3DS1 significantly heightened the risk of developing BD, while high-expressing KIR3DL1/S1 alleles in combination with null-expressing KIR3DL1 reduced the risk of the disease [69].