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Structure of the relevant mer genes and restriction endonuclease sites in plasmid pMRA17 and its derivatives. R, merR (regulatory gene); T, merT (encodes mercury transport protein); P, merP (encodes periplasmic mercury-binding protein); A, merA (encodes the enzyme mercuric reductase); G, merG (new gene for phenylmercury resistance); B, merB (encodes the enzyme organomercurial lyase). o/p, operator-promoter region.
