Scientists in China have manipulated embryonic stem cells to create laboratory mice with two male parents that managed to live to adulthood - though with significant developmental abnormalities - in what they are calling a noteworthy achievement in mammalian genetic engineering.

In a milestone in mammalian genetic engineering, a team of researchers from the Chinese Academy of Sciences succeeded in creating a viable bipaternal mouse from sperm provided by two male parents. The study,

Chinese researchers have successfully used complex embryonic stem cell engineering to create mice that have two fathers and successfully reached adulthood.