... imidazole is then unable to bind on the othermore hindered f ace of the porphyrin that bears the three a-carboxyphenyl groups and is stacked against the antibodyprotein (Fig. 7).This hypothesis is ... In¯uence of the addition of imidazole on the peroxidase activity of Fe(ToCPP), a,a-1, 2- and -a,b-1,2-F e(DoCPP) and their complexeswith 13G10. Variations of the initial rate of oxidation of 0.2 ... of antibody 13G10.It then appears that Fe(ToCPP) alone forms bis-imidazolecomplexes with imidazole and its deriva tives: 1-methyl-,1-benzyl-, 2-methyl-, 2-ethyl- and 4-methylimidazole. Thiswas...