Picture story. Considering a reducing plan.
Felsenfeld
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D006420:Hemeproteins / Q000737:chemistry*; D009573:Nitrites / Q000378:metabolism; D010084:Oxidation-Reduction; D050862:Oxidoreductases Acting on Sulfur Group Donors / Q000737:chemistry*; D013447:Sulfites / Q000378:metabolism
D006420:Hemeproteins; D009573:Nitrites; D013447:Sulfites; D050862:Oxidoreductases Acting on Sulfur Group Donors