FN1 and endometriosis: Simultaneously, FN-fibrin complexes with molecular masses ranging from 750, 1000, 1300, 1600 to 1900 kDa, which were assigned as complexes I–V, respectively, and their total relative amount in groups of endometriosis and fertility disorders, constituted 50.55% and 56.57%, respectively, of all molecular forms, while in the normal group, 13.24% only (Figure 3, Table 2).