The Linnaeus Centre for Bioinformatics, BMC, Uppsala University, Box 598, S-751 24 Uppsala, Sweden. canders@lcb.uu.se|The Linnaeus Centre for Bioinformatics, BMC, Uppsala University, Box 598, S-751 24 Uppsala, Sweden. canders@lcb.uu.se|The Linnaeus Centre for Bioinformatics, BMC, Uppsala University, Box 598, S-751 24 Uppsala, Sweden. canders@lcb.uu.se