654. 567. "Formation of Protein Charge Ladders by Acylation of Amino Groups on Proteins", Colton, I. J., Anderson, J. R., Gao, 3., Chapman, R. G., Isaacs, L. and Whitesides, G. M., J. Am. Chem. Soc., 1997, 119, 12701.12709. 566. "Formation and Reaction of Interchain Carboxylic Anhydride Groups on Self-A