[1] Birmingham Centre for Genome Biology,Department of Biological Sciences
[2] Institute of Cancer and Genomic Sciences,undefined
[3] University of Birmingham,undefined
[4] Genome Damage and Stability Centre,undefined
[5] School of Life Sciences,undefined
[6] University of Sussex,undefined
[7] School of Chemistry,undefined
[8] University of Birmingham,undefined
[9] Institute for Structural and Molecular Biology,undefined
[10] Birkbeck,undefined
[11] University of London,undefined
[12] Present address: Institute of Cell Biology,undefined
[13] University of Edinburgh,undefined
[14] Edinburgh,undefined
[15] UK.,undefined