FN1 and endometriosis: More specifically, FN-fibrin complexes with molecular masses of 750, 1,000, 1,300, 1,600, and 1,900 kDa were found in both groups of endometriosis and fertility disorders, and constituted 50.55% and 56.57% of all molecular forms, respectively, whereas in the healthy group, constituted only 13.24% of all forms.