KIR2DL1 and cervical squamous intraepithelial neoplasia: Arnheim et al.[25] did not find any single gene to be associated with CIN but found that a genotype comprising only KIR2DL1, KIR2DL2, KIR2DL3, KIR2DL4, KIR3DL1, KIR3DL2, KIR3DL3 and KIR2DS4 was associated with an increased risk of developing CIN.