CD8A and endometriosis: In baboons, a significant increase in the proportion of peritoneal CD8 T cells was detected in the group with long-term spontaneous endometriosis, when compared to other groups with no disease, induced disease, and recent spontaneous endometriosis (74.3 ± 6% vs 67.1 ± 8.3% vs 65.8 ± 8% vs 54.8 ± 21.9%, respectively; p = 0.01) (40).