1. Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Department of Molecular and Human Genetics, and Therapeutic Innovation Center (THINC), Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, United States
2. Department of Biological Chemistry, Center for RNA Biomedicine, University of Michigan Medical School, 1150 W. Medical Center Drive, Ann Arbor, Michigan 48109, United States
3. Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States