Detection of macaque chorionic gonadotropin in the placenta of the cynomolgus monkey (Macaca Fascicularis)

The biologically detectable period of macaque chorionic gonadotropin (mCG) was estimated by the mouse uterine weight method with 22 placentas of the cynomolgus monkey at various pregnancy stages. The hormone was detectable in the placental extracts of the 4th and 5th week of gestation, but not in those of the 6th week or later. This fact may be compatible with our previous finding that mCG was not detectable in urine after the 6th week of gestation in the cynomolgus monkey.