1. Department of Bioengineering, University of California at Berkeley, Berkeley, California 94720, United States
2. Department of Chemical Biology, University of California at Berkeley, Berkeley, California 94720, United States
3. Department of Molecular and Cellular Biology, University of California at Berkeley, Berkeley, California 94720, United States
4. Polymers for Adhesives, BASF SE, D-67056 Ludwigshafen, Germany
5. Department of Materials Science and Engineering, University of California at Berkeley, Berkeley, California 94720, United States
6. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States