To determine whether the expressions of H19, Igf1r, Igf1, Igf2, and Insr might be altered in the endometrium of woman with endometriosis, eutopic endometrial biopsies were collected during the late proliferative phase from women with and without endometriosis (see Appendix Table S1 for characterization of the patients). The gene discussed is IGF2; the disease is endometriosis.