wow. there’s crazy post on who-sucks dot com titled monstrous myostatin misfortunes with equally crazy pics of some mighty massive muscle magnification caused by myostatin deficiency. oh my! myostatin is a hormone that regulates muscle growth. too much myostatin and you may not have enough muscle mass. too little myostatin and, well, you are super buffed and strong without really trying. i have to remember to ask santa for just a wee bit of a myostatin deficiency this year. yikes.