The same approach could one day be used to allow a single man to have a biological child without a woman's egg.
Nature
From there, they used a mixture of the reversine drug and a fluorescent protein to duplicate the single X chromosome, thus making the XX set necessary for eggs to be formed. While this is undoubtedly a big achievement, the process has only had a one percent success rate, given that out of 630 attempts, only seven mice were born. What's more: only about six percent of the initial male mice cells were even able to lose one of their X chromosomes in the first place.
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