SOX9 and endometriosis: In contrast, SOX9 mRNA levels were significantly higher in tissue from women with endometriosis (median=1.2, IQR = 0.85–1.7, n = 6) compared with the healthy fertile control samples (median 0.2, IQR = 0.2–1, n = 3, P < 0.05, Fig. 1F).