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circulating human pregnancyassocialed plasma prolein-A is disulfide-bridged to the proform ofeosinophil major basic protein .2 Oxvig C,Sand O,Kristensen T,et al. J Biol Chem . 1993
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LOw maternalserumlevels of pregnancy-assciated plasma protein-A(PAPP-A)in the first trimester in association with abnormal fetal karyotype .2 Brambati B,Macintoah MCM,Teisner B,et al. Br J Obstet Gynaecol . 1993