Structural and Computational Biology Unit， European Molecular Biology Laboratory (EMBL)， 69117 Heidelberg， Germany.，Structural and Computational Biology Unit， European Molecular Biology Laboratory (EMBL)， 69117 Heidelberg， Germany; Hamburg Outstation， European Molecular Biology Laboratory， 22603 Hamburg， Germany.，Structural and Computational Biology Unit， European Molecular Biology Laboratory (EMBL)， 69117 Heidelberg， Germany.，Structural and Computational Biology Unit， European Molecular Biology Laboratory (EMBL)， 69117 Heidelberg， Germany; European Bioinformatics Institute (EMBL-EBI)， European Molecular Biology Laboratory， Hinxton CB10 1SD， UK.，Structural and Computational Biology Unit， European Molecular Biology Laboratory (EMBL)， 69117 Heidelberg， Germany.，Structural and Computational Biology Unit， European Molecular Biology Laboratory (EMBL)， 69117 Heidelberg， Germany.，Structural and Computational Biology Unit， European Molecular Biology Laboratory (EMBL)， 69117 Heidelberg， Germany; Izmir Biomedicine and Genome Center (IBG)， 35340 Izmir， Turkey.，Structural and Computational Biology Unit， European Molecular Biology Laboratory (EMBL)， 69117 Heidelberg， Germany.，Structural and Computational Biology Unit， European Molecular Biology Laboratory (EMBL)， 69117 Heidelberg， Germany; Max Delbrück Center for Molecular Medicine， 13125 Berlin， Germany; Molecular Medicine Partnership Unit， 69120 Heidelberg， Germany; Department of Bioinformatics， Biocenter， University of Würzburg， 97074 Würzburg， Germany.，Structural and Computational Biology Unit， European Molecular Biology Laboratory (EMBL)， 69117 Heidelberg， Germany. Electronic address: barabas@embl