1. Department of Cell Biology, Johns Hopkins School of Medicine, Baltimore, MD 21205, USA.
2. Department of Pathology, Division of GI/Liver Pathology, Johns Hopkins School of Medicine, Baltimore, MD 21205, USA.
3. Mechanobiology Institute and Department of Biological Sciences, National University of Singapore, Singapore, Singapore.
4. Microscope Facility, Johns Hopkins School of Medicine, Baltimore, MD 21205, USA.
5. Institute for Nanobiotechnology, Johns Hopkins University, Baltimore, MD 21218, USA.
6. Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA.
7. Department of Medicine, Division of Gastroenterology, Johns Hopkins School of Medicine, Baltimore, MD 21205, USA.
8. Department of Physiology, Johns Hopkins School of Medicine, Baltimore, MD 21205, USA.
9. Department of Biological Sciences, National University of Singapore, Singapore, Singapore.