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The abstract has an inconsistent mol/L unit in a later sentence; the 50 micromolar experimental concentration is explicit earlier.\nexposure: Mangiferin 50 micromolar in principal assays; etoposide co-exposure\nevidence_span: {\"source_cache\": \"artifacts/mangiferin-research/24374812.abstract.txt\", \"locator\": \"Primary indexed abstract; zero-based, end-exclusive Unicode character offsets\", \"file_sha256\": \"85ad69fcef2b1dd7b3842c076b89b76c9d54b73cc5843cefb3077642b6cb3451\", \"start_char\": 0, \"end_char\": 1789, \"text_sha256\": \"85ad69fcef2b1dd7b3842c076b89b76c9d54b73cc5843cefb3077642b6cb3451\"}\n[mangiferin-p24374812] Mangiferin activates Nrf2-antioxidant response element signaling without reducing the sensitivity to etoposide of human myeloid leukemia cells in vitro. 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