Expressed in immature GV-stage oocytes, mature MII-stage oocytes, parthenogenetically activated MII-stage oocytes and in pronuclear embryos (at protein level). During in vitro oocyte maturation, expression initially increases after 12 hours of culture, followed by a strong decline at 30 hours (MI stage) and 44 hours (MII stage). Expression remains constant in MII-stage oocytes after parthenogenetic activation, increasing in two- and four-cell parthenotes. Not detected in blastocyst stage embryos.