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The peptide preparation and its cellular origin remain disputed; chromium is not shown to be an obligatory catalytic metal of INSR.\nexposure: Insulin activation with added low-molecular-weight chromium-binding material\nevidence_span: {\"source_cache\": \"artifacts/chromium-research/9109644.abstract.txt\", \"locator\": \"Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets\", \"file_sha256\": \"23e955cef071c135f3935f440f4e333d49f494f004ceb22574df717c86bb7283\", \"start_char\": 0, \"end_char\": 939, \"text_sha256\": \"23e955cef071c135f3935f440f4e333d49f494f004ceb22574df717c86bb7283\"}\n[chromium-p9109644] Chromium oligopeptide activates insulin receptor tyrosine kinase activity. 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