Wu et al. [5] also explored NK inhibitor receptor (KIR) expression in endometriosis with flow cytometry, noting a significant increase in the mean fluorescence intensity of receptors NKB1 (183 ± 56 vs. 97 ± 45, p < 0.001) and EB6 (82 ± 45 vs. 53 ± 14, p = 0.021) in the peritoneal fluid of subjects with severe (III/IV) endometriosis compared with the controls. The gene discussed is KIR3DL1; the disease is endometriosis.