1. Research Unit in Bioinformatics (RUBi), Department of Biochemistry and Microbiology, Rhodes University, P.O. Box 94, Grahamstown 6140, South Africa
2. Faculty of Natural and Agricultural Sciences, Department of Genetics, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, South Africa
3. Department of Chemistry, Rhodes University, P.O. Box 94, Grahamstown 6140, South Africa