1. Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA.
2. Medical Scientist Training Program, Feinberg School of Medicine, Northwestern University, Chicago, IL 60211, USA.
3. Department of Internal Medicine, Northwestern University, Chicago, IL 60211, USA.
4. Applied Physics Program, Northwestern University, Evanston, IL 60208, USA.
5. Section of Gastroenterology, Boston Medical Center/Boston University School of Medicine, Boston, MA 02118, USA.
6. Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.
7. Chemistry of Life Processes Institute, Northwestern University, Evanston, IL 60208, USA.