TGFB1 and endometriosis: We and others have previously reported the involvement of Tregs in endometriosis [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18] in general and the promotion of the development of endometriosis through the transforming growth factor β1 (TGF-β1) and platelet-derived growth factor (PDGF) signaling pathways in particular [18].