Growing up in the rural town of Rockholds, Kentucky, 13-year-old Brantley Marlow has experienced no shortage of adventure. On a sunny day, he might be found catching catfish or crawdads at the neighborhood river, playing with his rambunctious chocolate Labrador Retriever, or helping tend to his family’s chicken coop. Saturday mornings at the Marlow household are typically spent indulging in a spread of gravy and biscuits, a southern staple prepared by his mother, Dianna. Like most teenage boys, Brantley enjoys movies, video games and hanging out with friends, none of which has changed since he received his diagnosis of Duchenne muscular dystrophy (DMD) at age seven. DMD is caused by a genetic mutation and results from muscles not having enough dystrophin, which is a key part of a group of proteins that strengthen and protect muscles as they contract and relax.