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The authors state the exact mechanism by which the enzyme protects remains to be elucidated.\nexposure: Hyperbaric oxygen in vitro, 2 hours at 3 bar; tin-mesoporphyrin IX\nevidence_span: {\"source_cache\": \"artifacts/hbot-research/11751428.abstract.txt\", \"locator\": \"Indexed abstract; zero-based, end-exclusive Unicode character offsets\", \"file_sha256\": \"d8fb2631feb55cff2514149c0935ad25230bbdc520cc82dddaec2baa4ada40f3\", \"start_char\": 0, \"end_char\": 1641, \"text_sha256\": \"d8fb2631feb55cff2514149c0935ad25230bbdc520cc82dddaec2baa4ada40f3\"}\n[hbot-p11751428] Involvement of heme oxygenase-1 (HO-1) in the adaptive protection of human lymphocytes after hyperbaric oxygen (HBO) treatment. 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