Changes of placental proteases, which degrade vasoactive peptides, in maternal sera at the onset of preeclampsia. - Mohamed,S.A.; Mizutani,S.; Salem,H.T.; Mostafa,S.AM.; Itakura,A.; Hassan,N.A.; Kuno,N.; Kurauchi,O.; Tomoda,Y. (Med Sci Res, 1995)