<prompt> Schwangershaft protein is the other name of :hCGPapp-1Pregnancy specific beta1 glycoproteinActivin  <response>: PREGNANCY SPECIFIC b-1 GLYCOPROTEIN PS b-1 G: It is produced by the trophoblast cells. It can be detected in the maternal serum 18-20 days after ovulation. PS b-1 G is a potent immunosuppressor of lymphocyte proliferation and prevents rejection of the conceptus. Reference: Duttas Textbook of Obstetrics 7th edition page 61 