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The indexed abstract identifies AMPK depletion without resolving the targeted catalytic isoform; family-level identity is retained. This is not a dietary repletion or human treatment experiment.\nexposure: Chromium picolinate during chronic low-dose insulin exposure, followed by acute insulin response; AMPK siRNA\nevidence_span: {\"source_cache\": \"artifacts/chromium-research/24725432.abstract.txt\", \"locator\": \"Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets\", \"file_sha256\": \"f172a147ded27e509e27d5bcc53ad6dc3e8b22b424ab021515b205ae29bccbc4\", \"start_char\": 0, \"end_char\": 1788, \"text_sha256\": \"f172a147ded27e509e27d5bcc53ad6dc3e8b22b424ab021515b205ae29bccbc4\"}\n[chromium-p24725432] Chromium enhances insulin responsiveness via AMPK. 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