South African National Bioinformatics Institute, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa. estienne@sanbi.ac.za|South African National Bioinformatics Institute, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa. estienne@sanbi.ac.za|South African National Bioinformatics Institute, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa. estienne@sanbi.ac.za