1. Center for Muscle Biology, University of Kentucky, Lexington, Kentucky;
2. Department of Physiology, College of Medicine, University of Kentucky, Lexington, Kentucky;
3. Department of Rehabilitation Sciences, College of Health Sciences, University of Kentucky, Lexington, Kentucky;
4. Department of Molecular and Integrative Physiology, Medical School, University of Michigan, Ann Arbor, Michigan; and
5. Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden