... shown some success with this idea. Six pregnancies have produced 10 babies from cryopreserved donor oocytes in these reports. The use of frozen donor oocytes after thawing not for whole egg donation, but for ooplasmic transfer has been reported with a successful delivery of a twin following thawed ooplasmic donation. Whether mature or not, the standard cryopreservation technologies appear to have their crucial ... suitably consistent. With the production of good quality mid to fully expanded zygotes with well-defined development on day, five or six, it is possible to settle on consisten...

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