1. Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, Senator Paul D. Wellstone Muscular Dystrophy Cooperative Research Center, University of Texas Southern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA.
2. Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
3. Heidelberg University Hospital, Center for Infectious Diseases, Virology, Cluster of Excellence Cell Networks, DZIF partner, BioQuant Center, Heidelberg D-69120, Germany.
4. Department of Biochemistry, University of Washington, Seattle, WA 98195, USA.