Concerning the menstrual cycle phases, the authors observed that the number of DN iNKT cells expressing IL-17 in the secretory phase was decreased in patients with endometriosis compared to the control group (7.1 [0–13.8] vs. 14.0 [8.1–21.4]; p = 0.049) (Fig. 4D). The gene discussed is IL17A; the disease is endometriosis.