1. Sealy Center for Structural Biology and Molecular Biophysics, The University of Texas Medical Branch, Galveston, Texas 77555, United States
2. Department of Biochemistry and Molecular Biology, The University of Texas Medical Branch, Galveston, Texas 77555, United States
3. Department of Integrative Biology & Pharmacology, University of Texas Health Science Center at Houston, Houston, Texas 77030, United States
4. Texas Therapeutics Institute, Institute of Molecular Medicine, University of Texas Health Science Center at Houston, Houston, Texas 77030, United States