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Motlhanka, D.M.T, Habtemariam, S. and Houghton, P. (2008) Free radical scavenging activity of crude extracts and 4´-O-methylepigallocatechin isolated from roots of Cassine transvaalensis Burtt-Davy from Botswana. African Journal of Biomedical Research, 11 (1). pp. 55-63. ISSN 1119-5096