Oocytes created with cells from two males | mice

Researcher Katsuhiko Hayashi, from the University of Kyushu (Japan), took the stage of a scientific conference to present a different concept of fertilization in mice: male cells gave rise to an oocyte. As? Through genetic editing – a kind of modern cut and sew – the XY male sex chromosomes were transformed into the XX female chromosomes. And that was enough to create the first mature mammalian oocytes with only male cells.