Ferredoxins are iron-sulfur proteins that transfer electrons in a wide variety of metabolic reactions. Binds 1 [2Fe-2S] cluster. In radish there are 4 ferredoxins: 2 are root-specific (R-B1 and R-B2), one is present in both leaves and roots (L-A), and there is a minor form which is leaf specific (L-B). Belongs to the 2Fe2S plant-type ferredoxin family.