Scientists at the MRC-MBU in Cambridge, U.K., have discovered how a key transport protein, called the mitochondrial ADP/ATP carrier, transports adenosine triphosphate (ATP), the chemical fuel of the cell. This process is vital to keep us alive, every second of our lives, for all of our lives. This work will help us understand how mutations can affect the function of these proteins, resulting in a range of neuromuscular, metabolic and developmental diseases.