poFUT1 was expressed in the uterine endometrium, and the immunofluorescent staining showed the higher levels of poFUT1 in the secretory phase compared with those in the proliferative phase, with the highest expression in the decidual phase of early pregnancy; whereas the levels of poFUT1 were decreased in miscarriage patients (Fig. 1a). Here, POFUT1 is linked to spontaneous abortion.