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Metal ion accumulation in transgenic E. coli. Comparison of zinc (Zn) and cadmium (Cd) ion accumulation after 3 h of Zn2+ (A) and Cd2+ (B) ion treatment in E. coli cells heterologously expressing CsMTL2, CsMTL2m, HsMTXb, and PCL. The error bars represent standard errors of the mean from at least three independent experiments. Statistical significance was based on a Student’s t-test **: p < 0.01. DW: dry weight.
