1 Institute of Clinical Sciences, Faculty of Medicine, Imperial College London, London SW7 2AZ, UK; Computational Regulatory Genomics, MRC London Institute of Medical Sciences, London, W12 0NN, UK. Electronic address: b.lenhard@imperial.ac.uk.
2 Structural Bioinformatics Group, Centre for Integrative systems Biology and Bioinformatics, Department of Life Sciences, Imperial College London, London SW7 2AZ, UK. Electronic address: m.sternberg@imperial.ac.uk.