1. The David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
2. Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
3. Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
4. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
5. Division of Gastroenterology, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA.