A hormone called progesterone is important for preparing the uterine lining for egg implantation and in maintaining the early stages of pregnancy. Almost one in three women with European descent inherited a genetic variant of the progesterone receptor called V660L from Neanderthals. According to a new study, its carriers have higher fertility, more siblings, fewer miscarriages, and less bleeding during early pregnancy. Zeberg et al found V660L in...
