[1] Birkbeck College,Department of Crystallography and Institute for Structural and Molecular Biology
[2] Malet Street,Department of Pathology
[3] London WC1E 7HX,undefined
[4] UK,undefined
[5] VU University Medical Center,undefined
[6] De Boelelaan 1117,undefined
[7] 1081 HV Amsterdam,undefined
[8] The Netherlands,undefined
[9] Present address: Department of Molecular Microbiology,undefined
[10] Groningen Biomolecular Sciences and Biotechnology Institute,undefined
[11] University of Groningen,undefined
[12] Kerklaan 30,undefined
[13] 9751 NN Haren,undefined
[14] The Netherlands.,undefined