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Commonly expressed housekeeping (HK) genes among MII stage oocytes, preimplantation embryos and tissues. Common HK genes (n = 219) were defined as those present in at least 80% of the lists of actively expressed genes (top 2,000) in MII stage oocytes, preimplantation embryos and 12 different tissues. The percentages of common HK genes actively expressed in oocytes, preimplantation embryos and tissues are shown.
