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The level of resistance to Hg2+ determined by the inducible mer operon of plasmid NR1 was essentially the same for three gene copy number variants in Escherichia coli, less in Proteus mirabilis, and intermediate in P. mirabilis "transitioned" to a high r-determinant gene copy number. Cell-free volatilization rates of radioactive mercury indicated increasing levels of intracellular mercuric reductase enzyme from low- to high-gene copy number forms in P. mirabilis and from low- to high-copy number forms in E. coli, but the additional enzyme in E. coli was effectively cryptic.
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