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Heterogeneity of C. sake isolates near a Pb-polluted mine site. Independent isolates of C. sake obtained from control (□) or Pb-polluted (▪) locations at Site 2 were spread plated to MYP agar supplemented with different Pb(NO3)2 concentrations. Colonies were enumerated after 14 days, and dose-response curves were constructed. Heterogeneity (A) and IC50 (B) determinations were as described in the legend to Fig. 2.
