FIG. 1.

Size exclusion chromatography of Cu/Zn SODs. Whole-cell extracts from strains producing a single SOD were separated on a Superdex 75 gel filtration column, and fractions (0.2 ml) were assayed for SOD activity. For each sample, the activities were plotted relative to the fraction with the highest activity. The activities produced in these strains are given in Tables 3 and 5. (A) The strain used was AS391 with pMC101, pRK101, pRK105, or pRK106. (B) The strain used was AS391 with pMEK15, pEM101, pEM102, or pEM103. Ba, B. abortus; Ps, P. syringae.