1. Department of Pharmacology, UT Southwestern Medical Center, Dallas, TX 75390, USA.
2. Department of Pediatrics, University of Pittsburgh, Pittsburgh, PA 15224, USA.
3. Department of Gastroenterology and Shanghai Key Laboratory of Pancreatic Disease, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, China.
4. Department of Pediatrics, Stanford University, Palo Alto, CA 94305, USA.
5. Department of Molecular Biology, UT Southwestern Medical Center, Dallas, TX 75390, USA.
6. Howard Hughes Medical Institute, UT Southwestern Medical Center, Dallas, TX 75390, USA.