Eutopic endometrium of the control group (1.95 ± 0.35) displayed significantly higher BTG1 mRNA expression than both eutopic (1.12 ± 0.14; p = 0.048) and ectopic (0.81 ± 0.22; p = 0.004) endometrium of the endometriosis group (Figure 1A). The gene discussed is BTG1; the disease is endometriosis.