2.3. Correlations between the Expression Level of TGF-ß1, SMAD3, ILK and miR-21 in 3 Different Biological Materials (Ectopic Endometrium–ECE, Eutopic Endometrium–EUE, and PBMCs) Obtained from the Same Patient with Endometriosis. Here, ILK is linked to endometriosis.