Quantitative MMP-2 secretion in second trimester amniotic fluid of women with normotensive pregnancies and women who developed a hypertensive disorder in pregnancy. MMP-2 secretion expressed as ng/ml MMP-2. A - MMP-2 secretion, as detected by ELISA kit (detected both pro and active forms) of amniotic fluid samples from women with normotensive pregnancies (n = 47) and women who developed a hypertensive disorder in pregnancy (n = 17). T-test, *P < 0.0004. B - Bar graph representing mean ± SEM quantitative MMP-2 secretion level divided into subgroups. T-test, *P < 0.05.