In this cryopreservation technique eggs or embryos are stored at -196°C. At this temp embryos or eggs are in suspended animation. They are stored in liquid nitrogen. You can then unfreeze them for use in the future.

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It's not exactly a infertility treatment as I understand it.

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in a way, it can be called an infertility treatment, like in the case of Louise Brown's parents, her mother had blocked fallopian tubes, so she couldn't conceive.

since her birth, SPF has been used to conceive children by those who can't seem to give birth naturally.

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this can still be consider an option of infertility treatment, yet this is newer.

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