国产精品视频一区二区三区四,亚洲av美洲av综合av,99国内精品久久久久久久,欧美电影一区二区三区电影

Pregnancy-associated glycoproteins （PAGs） belonging to the multigene family encoded by the aspartic protease gene, are a group of specific glycoproteins synthesized and secreted by placental trophoblast giant cells of artiodactyls, which can be detected in the maternal circulation after embryo attachment. It has the potential to serve multiple functions, including embryonic attachment, placental development, pregnancy maintenance, embryo survival, proteolytic activity, and immune regulation, which are most often used as biomarkers for early pregnancy diagnosis and assessment of embryo loss, as well as indicators of evaluation of fetal viability and monitoring placental health.