The number of cells expressing CD25 was similar between the endometriosis and control groups in both the CD4+ iNKT (33.5 ± 23.1 vs. 25.8 ± 18.5; p = 0.168) and the DN iNKT subsets (39.7 ± 31.8 vs. 33.8 ± 29.8; p = 0.416) (Table 2). Here, CD4 is linked to endometriosis.