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[Biosynthesis of pregnancy-specific beta1-globulin in rats in an in vivo system].

It has been demonstrated that pregnancy-specific beta1-globulin is synthesized by the rat placenta. Other organs of pregnant animals (liver, kidneys, lungs, heart, spleen) were incapable of synthesizing this antigen. The greatest amount of pregnancy-specific beta1-globulin is observed in the blood of intact animals on the 11th day after the introduction of ground placental tissue.