1. Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
2. Department of Medicine, Gastrointestinal Unit and Center for the Study of Inflammatory Bowel Disease, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114, United States
3. Department of Medicine, Division of Digestive and Liver Diseases, and Department of Immunology, University of Texas Southwestern Medical Center, 5959 Harry Hines Boulevard, Dallas, Texas 75390, United States
4. Department of Biological Sciences, University of Delaware, Newark, Delaware 19716, United States