obsolete ferredoxin biosynthetic process true biological_process ferredoxin synthesis This term was made obsolete because it refers to biosynthesis of a protein. ferredoxin formation OBSOLETE. The chemical reactions and pathways resulting in the formation of ferredoxin, any simple, nonenzymatic iron-sulfur protein that is characterized by having equal numbers of atoms of iron and labile sulfur. Iron and sulfur atoms are present in one or two clusters of two or four atoms of each. GO:0043172 ferredoxin biosynthesis ferredoxin anabolism