Human endometrium and menstrual fluid contain placental protein 5 (PP5).

@article{Btzow1986HumanEA,
  title={Human endometrium and menstrual fluid contain placental protein 5 (PP5).},
  author={Ralf B{\"u}tzow and Henrik V. Alfthan and Mervi K A Julkunen and E. -M. Rutanen and Henning Bohn and Maija Sepp{\"a}l{\"a}},
  journal={Human reproduction},
  year={1986},
  volume={1 5},
  pages={
          287-9
        }
}
Placental protein 5 (PP5), a serine protease inhibitor, was found in the endometrium and menstrual fluid of non-pregnant women. PP5 was present in all 16 endometrial samples taken at various phases of the menstrual cycle. In the secretory phase, the endometrial PP5 content was higher (median 17.4 micrograms/g protein; n = 8) than in the proliferative phase (median 3.8 micrograms/g protein; n = 8). In gel filtration, endometrial tissue homogenates yielded one immunoreactive peak corresponding to… CONTINUE READING