Ferredoxin-3 Ferredoxins are iron-sulfur proteins that transfer electrons in a wide variety of metabolic reactions. Ferredoxin III 98 Ava_4259 fdxB FER3_ANAVT MATLTGLTFGGQVWTPQFVEAVNQDKCIGCGRCFKACGRNVLILQALNENGEFVEDEEGEEIERKVMSIIHPEYCIGCQACARACPKNCYTHSPLEHN