Bioinformatics Research Centre, University of Glasgow, Glasgow, UK. jmorriso@dcs.gla.ac.uk|Bioinformatics Research Centre, University of Glasgow, Glasgow, UK. jmorriso@dcs.gla.ac.uk|Bioinformatics Research Centre, University of Glasgow, Glasgow, UK. jmorriso@dcs.gla.ac.uk|Bioinformatics Research Centre, University of Glasgow, Glasgow, UK. jmorriso@dcs.gla.ac.uk