1. Department of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA.
2. Department of Biological Engineering, MIT, Cambridge, MA 02139, USA.
3. Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA.
4. Department of Biology, MIT, Cambridge, MA 02139, USA.
5. BioSystems and Micromechanics (BioSyM) IRG, Singapore-MIT Alliance for Research and Technology, Singapore, Singapore.