Biomedical Informatics Training Program, Stanford University, Stanford, CA 94305, USA.|Inflammation & Immunology, Pfizer Inc., Cambridge, MA 02139, USA.|Hills Pet Nutrition, Topeka, KS 66617, USA.|Inflammation & Immunology, Pfizer Inc., Cambridge, MA 02139, USA.|Division of Gastroenterology, Hepatology and Nutrition, Boston Childrens Hospital, Harvard Medical School, Boston, MA 02115, USA.|Department of Gastroenterology, Hepatology and Endoscopy, Brigham and Womens Hospital, Harvard Medical School, Boston, MA 02115, USA.|Inflammation & Immunology, Pfizer Inc., Cambridge, MA 02139, USA.|Department of Genetics.