London: Scientists have identified molecular signals that control whether embryos are accepted by the womb, and their abnormal functioning is linked to repeated miscarriages in women. Researchers from Imperial College London and the University of Warwick found molecular signals which appear to function abnormally in women who have suffered repeated miscarriages. At the start of pregnancy, the fertilised embryo must embed itself in the lining of the uterus. The uterus is only receptive to embryos for a few days in each menstrual cycle, ensuring that embryos can only implant at the right stage of development. Currently, scientists know only a few details about the biological processes that control when an embryo can be implanted.
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