Take a look at the results of myosatin

Myosatin

http://www.npr.org/templates/story/story.php?storyId=6479550

Mighty Mouse was not just a cartoon. Ten years ago, scientists demonstrated that they could increase an animal's muscle mass by manipulating a protein in mice called myostatin. Now drugs that affect myostatin are being hailed as the best hope yet for people with muscle-wasting diseases.

Everything is new and beautiful