https://www.popsci.com/muscular-animals-babies-myostatin/ https://www.popsci.com/muscular-animals-babies-myostatin/ We already have mutant cattle, and dogs, an

https://www.popsci.com/muscular-animals-babies-myostatin/ https://www.popsci.com/muscular-animals-babies-myostatin/ We already have mutant cattle, and dogs, and mice.