1 Department of Chemical and Biomolecular Engineering, University of California, Irvine, Irvine, CA 92697-3900, United States of America.
2 Department of Chemical and Biomolecular Engineering, University of California, Irvine, Irvine, CA 92697-3900, United States of America; Department of Biomedical Engineering, University of California, Irvine, Irvine, CA 92697-3900, United States of America; Department of Biological Chemistry, University of California, Irvine, Irvine, CA 92697-3900, United States of America. Electronic address: han.li@uci.edu.