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Sources of rhein: (A) Rheum rhabarbarum (Kay Yatskievych/ www.discoverlife.org); (B) Aloe spp. (Pankaj Oudhia/ www.discoverlife.org); (C) Cassia fistula (John Pickering/ www.discoverlife.org); (D) Polygonum cuspidatum (Les Mehrhoff/ www.discoverlife.org).
