Purity: > 90% by SDS - PAGE Format: Liquid. In 20mM Tris (pH6.8) containing 40% glycerol and 1mM DTT.. PSG5, also known as pregnancy-specific beta-1-glycoprotein 5, a member of the PSG family that is mainly produced by the placental syncytiotrophoblasts during pregnancy. The function of PSG5 stimulates secretion of TH2-type cytokines from monocytes, and they may also modulate the maternal immune system during pregnancy, thereby protecting the semi-allotypic fetus from rejection. Recombinant human PSG5 protein, fused to His-tag at C-terminus, was expressed in insect cell and purified by using conventional chromatography techniques.