A mammal that is the daughter of two female parents has been created for the first time.

It was created by combining the genetic material of two egg cells, circumventing the “imprinting” barrier in mammals (certain genes necessary for embryo development are shut down in the sperm and egg; only when they meet are all of the key genes available) by manipulating the nucleus of a female egg to make it more male-like.

While not applicable to humans, the technique could help optimize fertility techniques and make animal cloning more efficient.