1. GSK, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K.
2. Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, U.K.
3. The Francis Crick Institute, London NW1 1AT, U.K.
4. GSK, South Collegeville Road, Collegeville, Pennsylvania 19426, United States