1Cancer Research United Kingdom, Cell Cycle Genetics Research Group, Department of Genetics, University of Cambridge, Downing Street, Cambridge CB2 3EH, United Kingdom
2The Computer Laboratory, William Gates Building, 15 JJ Thomson Avenue, Cambridge CB3 0FD, United Kingdom
3Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge CB2 3EH, United Kingdom
4Cyclacel Limited, Babraham Science Park, Babraham Hall, Babraham, Cambridge CB2 4AT, United Kingdom