Krishna Kannan1, Daniel G Gibson2,3. 1. Synthetic Genomics, Inc., 11149 North Torrey Pines Road, La Jolla, CA 92037, USA. 2. Synthetic Genomics, Inc., 11149 North Torrey Pines Road, La Jolla, CA 92037, USA. dgibson@syntheticgenomics.com. 3. J. Craig Venter Institute, 4120 Capricorn Lane, La Jolla, CA 92037, USA.