1. Department of Chemistry of Biomacromolecules, Institute of Chemistry, National Autonomous University of Mexico, Mexico City C.P. 04510, Mexico
2. Department of Molecular Biosciences, University of Texas at Austin, Austin, Texas 78712, United States
3. Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, Texas 78712, United States
4. Center for Systems and Synthetic Biology, University of Texas at Austin, Austin, Texas 78712, United States