1. Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas 77843, United States
2. Department of Biochemistry and Molecular Biology
3. Department of Chemistry
4. Department of Biochemistry and Center for Biomedical Neuroscience, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78229, United States, and Department of Chemistry, University of Texas at San Antonio, San Antonio, Texas 78249, United States