1. Phytomedicine Program,
Department
of Paraclinical Sciences, Faculty of Veterinary Science, University of Pretoria, Private Bag X04, Onderstepoort
0110, South Africa
2. Department
of Biochemistry,
Faculty of Natural and Agricultural Sciences, University of Pretoria,
and African Centre for Gene Technologies, P.O. Box 75011, Lynnwood Ridge 0040, South Africa