Figure 1

In subsequent sections of a uteroplacental unit obtained in day 15 of pregnancy, the multilayered subplacenta (SP), and the initial sprouts that give origin to the placenta, expressed K1, MMP-2 and MMP-9. Syncytiotrophoblasts composing the interlobium and the labyrinth expressed K1, MMP-2 and MMP-9 in sections obtained in days 20, 40 and 60 of pregnancy. Bar = 50 μm.