1. Department of Chemistry University of Otago Dunedin 9016 New Zealand
2. Drug Discovery Biology Monash Institute of Pharmaceutical Sciences Parkville VIC 3052 Australia
3. School of Pharmacy University of Otago Dunedin 9054 New Zealand
4. ARC Centre for Cryo-electron Microscopy of Membrane Proteins Monash University Parkville VIC 3052 Australia