1. Department of Biochemistry, University of Texas Health Science Center at San Antonio, MSC 7760, 7703 Floyd Curl Drive, San Antonio, Texas 78229-3990, United States
2. Department of Biochemistry and Molecular Genetics, Midwestern University, 19555 North 59th Avenue, Glendale, Arizona 85308, United States
3. Department of Genetics, Cell Biology and Development, Masonic Cancer Center and Developmental Biology Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
4. Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15260, United States