VOLTAMMETRIC CHARACTERIZATION OF RAPID AND REVERSIBLE BINDING OF AN EXOGENOUS THIOLATE LIGAND AT A [4FE-4S] CLUSTER IN FERREDOXIN-III FROM DESULFOVIBRIO-AFRICANUS - Butt, J; Sucheta, A; Armstrong, F; Breton, J; Thomson, A; Hatchikian, E (1993)