Izumi-Yoneda N, Toda A, Okabe M, Koike C, Takashima S, Yoshida T, Konishi I, Saito S, Nikaido T. Alpha 1 antitrypsin activity is decreased in human amnion in premature rupture of the fetal membranes. Molecular Human Reproduction. 2008 Dec 10;15(1):49–57. doi: 10.1093/molehr/gan071.