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- ArticleSchrode J, Folk JE.J Biol Chem. 1978 Jul 25;253(14):4837-40.Transglutaminases were found to catalyze the formation of cross-links between peptide chains by means of a transfer reaction between the carboxamide group of a glutamine residue in each chain and both primary amino groups of a diamine or a polyamine. Production of this heretofore undescribed linkage by guinea pig liver transglutaminase was demonstrated by the use of high performance liquid chromatography in a model system using glutamine peptide derivatives and a variety of diamines and polyamines. Evidence for intermolecular cross-linking through polyamines with both the liver enzyme and thrombin-activated human plasma blood coagulation factor XIII was obtained by the use of a guanidinated derivative of beta-casein.