5385-5392 37 Enemark, J. H. and Young, C. G. (1993) Adv. Inorg. Chem. 40, 1-88 37a Howes, B. D., Bray, R. C., Richards, R. LA., Turner, N. A., Bennett, B. and Lowe, D. J. (1996) Biochemistry, in the press 38 Howes, B. D., Bennett, B., Bray, R. C., Richards, R. L. and Lowe, D. J. (1994) J. Am. Chem. Soc. 116, 11624-1 1625 39 Gambarotta, S., Floriani, C., Chiesi-Villa, A. and Guastini, C. (1985) ...