1. Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
2. Department of Biochemistry, University of Bayreuth, Bayreuth 95447, Germany
3. Department of Biosciences, Rice University, 6100 Main Street, Houston, Texas 77005, United States
4. Department of Bioengineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States