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Vitrified GV-stage oocytes are morphologically indistinguishable from fresh oocytes and mature to the MII stage in culture. A) Fresh oocyte. B) Vitrified oocyte. C) Vitrified MII-stage oocyte following IVM. Note GVBD and first polar body formation. Representative photographs from 265 vitrified oocytes are shown in B and C. Original magnification ×120.
