Belgian Blue bulls look like they are made of muscle because they have a mutation in the gene that codes for the protein myostatin. In humans, as in other types of cattle, myostatin normally limits the number of muscle fibers that form before birth and then limits the growth of those fibers later on.

Excellent piece on NPR this morning about a new drug used to help treat muscle disorders. The drug has incredible potential to benefit individuals with muscle disorders and those recovering from injury, but fear is great that it will become the next big thing for athletes looking to boost performance:

http://www.npr.org/blogs/health/2013/08/12/210487410/new-muscle-drugs-could-be-the-next-big-thing-in-sports-doping?utm_medium=Email&utm_source=DailyDigest&utm_campaign=20130812