Research is still in its early stages. It involves the conversion of male XY sex chromosomes into female XX sex chromosomes.

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Prof. Katsuhiko Hayashi of Osaka University is developing a method for treating infertility.

The development, which he has submitted for publication in the scientific journal Nature, has allowed male couples to have more children together.

Professor George Daley of Harvard Medical School, who was not involved in the research, said there was a long way to go before society faced such a decision.

''Hayashi's work is unpublished but interesting. [Doing this with humans] is much more difficult than with mice,” he says. We still don't understand the unique biology of human gametogenesis. (germ cell formation) was sufficient to reproduce Hayashi's provocative work in mice.''

The details were presented at the Human Gene Editing Summit at the Crick Institute in London.