1. Department of Developmental Biology, Washington University in St. Louis School of Medicine, St. Louis, Missouri, United States
2. Department of Pediatrics, Washington University in St. Louis School of Medicine, St. Louis, Missouri, United States
3. Department of Medicine, Washington University in St. Louis School of Medicine, St. Louis, Missouri, United States
4. Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana, United States