Sharaev P N, Bogdanov N G
Biull Eksp Biol Med. 1979 Jul;88(7):53-5.
It has been shown that pregnancy specific beta 1-globulin (SBG) is found in the rat blood serum on the 6--7th day of pregnancy. SBG reaches the maximum by the end of pregnancy and is not detected already at the 3d--4th day after delivery. The placenta is the site of the SBG snythesis. Other organs of the pregnant rat are not able to incorporate radioactive aminoacids into the protein in vitro.
