BaseClear B,V,, Genome analysis and technology department, Einsteinweg 5, Leiden 2333 CC, The Netherlands.|BaseClear B.V., Einsteinweg 5, 2333 CC Leiden, Leiden,The Netherlands.|Bioinformatics Group, Wageningen University, Wageningen, The Netherlands.|Bioinformatics Group, Wageningen University, Wageningen, The Netherlands.