USF2 and endometriosis: The aberrant expression of CYP19A1 and SF-1 genes in eutopic and ectopic endometria of women with endometriosis led us to study USF2 variants protein contents in human endometrium throughout the menstrual cycle and the effect of estrogenic and proinflammatory environments in epithelial cells of eutopic endometrium from women with and without endometriosis.