Plasminogen activator inhibitor types 1 and 2 in human trophoblasts. PAI-1 is an immunocytochemical marker of invading tropho-blasts. - Feinberg, RF; Kao, L-C; Haimowitz, JE; Queenan Jr, JT; Wun, T-C; Strauss III, JF; Kliman, HJ (Lab Invest, 1989)