We characterized the superoxide dismutases of , and after electrophoresis. Comparisons of the metal contents (as determined by sensitivity to hydrogen peroxide) and the relative mobilities of the dismutases showed that the dismutases of all six isolates of were identical to each other and to the dismutase of strain T2B. The dismutase of was similar to the dismutases of the strains in that it also contained manganese. However, the dismutase of strain NRL 30014 was more similar to the dismutases of 17 other strains previously tested in that it appeared to contain iron instead of manganese.


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