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The NDI1 rescue is strong evidence that the effects run through complex I in this model, not evidence of an antitumour indication.\nexposure: Metformin in the presence and absence of glucose; NDI1 overexpression\nevidence_span: {\"source_cache\": \"artifacts/metformin-research/24843020.abstract.txt\", \"locator\": \"Indexed abstract; zero-based, end-exclusive Unicode character offsets\", \"file_sha256\": \"21403805272b0d702f0f60887d805b1e52b4ce87a9335fcde1d34cefda8b16ae\", \"start_char\": 0, \"end_char\": 1142, \"text_sha256\": \"21403805272b0d702f0f60887d805b1e52b4ce87a9335fcde1d34cefda8b16ae\"}\n[metformin-p24843020] Metformin inhibits mitochondrial complex I of cancer cells to reduce tumorigenesis. 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