noun Biochemistry.

  1. any of a group of red-brown proteins containing iron and sulfur and acting as an electron carrier during photosynthesis, nitrogen fixation, or oxidation-reduction reactions.


  1. an iron- and sulphur-containing protein found in plants and microorganisms and involved in photosynthesis and nitrogen fixation


  1. A protein found in green plants, algae, and anaerobic bacteria, containing iron and labile sulfur in equal amounts, and functioning in electron transport reactions in biochemical processes, such as photosynthesis.

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