Computational Biology Unit, Bergen Centre for Computational Sciences, University of Bergen, Norway. ketil.malde@bccs.uib.no|Computational Biology Unit, Bergen Centre for Computational Sciences, University of Bergen, Norway. ketil.malde@bccs.uib.no|Computational Biology Unit, Bergen Centre for Computational Sciences, University of Bergen, Norway. ketil.malde@bccs.uib.no|Computational Biology Unit, Bergen Centre for Computational Sciences, University of Bergen, Norway. ketil.malde@bccs.uib.no