Yesterday, in the journal Cell Stem Cell, a team of researchers at the Chinese Academy of Sciences reported the birth of healthy offspring to same-sex mouse parents. By modifying the genomes of eggs to resemble those of sperm, and vice versa, the scientists were able to overcome a major hurdle in biological reproduction. Pups from female-female unions survived well into adulthood, even becoming mothers themselves, and short-lived babies were welcomed by a dad-dad duo.
Scientists used modified egg and stem cells to create female mice with two mothers. These fatherless mice grew up to have babies of their own (through more typical means of conception). (Le-Yun Wang / Chinese Academy of Sciences)