Which protein is associated with hyperemesis gravidarum during pregrancy?
['Maternal smoking, BMI, parity, ethnicity, fetal gender, placental weight and hyperemesis gravidarum symptoms were associated with total hCG. ', 'First trimester maternal serum PAPP-A and free β-HCG levels in hyperemesis gravidarum.', 'HG is associated with elevated levels of PAPP-A and free β-hCG, and such changes are independent of serum indicators of thyroid and liver function.', "hCG promotes progesterone production by corpus luteal cells; promotes angiogenesis in uterine vasculature; promoted the fusion of cytotrophoblast cell and differentiation to make syncytiotrophoblast cells; causes the blockage of any immune or macrophage action by mother on foreign invading placental cells; causes uterine growth parallel to fetal growth; suppresses any myometrial contractions during the course of pregnancy; causes growth and differentiation of the umbilical cord; signals the endometrium about forthcoming implantation; acts on receptor in mother's brain causing hyperemesis gravidarum, and seemingly promotes growth of fetal organs during pregnancy. "]
['Human chorionic gonadotropin (hCG) is associated with hyperemesis gravidarum during pregrancy.']
['Human chorionic gonadotropin', 'hCG']