1. Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, PO Wits, 2050 Johannesburg, South Africa
2. Department of Biology, New Mexico State University, Las Cruces, New Mexico 88003, United States
3. Max Planck Institute for Molecular Physiology, Dortmund, Germany
4. Chemical Genomics Centre of the Max Planck Society, Dortmund, Germany
5. Department of Chemistry and Polymer Sciences, Stellenbosch University, Stellenbosch 7600, Western Cape, South Africa