SUMMARY: The utilization of arginine was studied in several different species. The arginine decarboxylase and agmatine deiminase pathways were found to be characteristic of species of group I as defined by Palleroni (1974). strains had three distinct arginine catabolic pathways initiated by arginine decarboxylase, arginine deiminase and arginine oxidase, respectively. The two former routes were also present in and and in which also used arginine by a further unknown pathway. None of these pathways occurred in strains; agmatine catabolism seemed to follow an unusual route involving guanidinobutyrate as intermediate.


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