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Overlay of β-barrel (Upper) and MP (Lower) domains of ZneB (orange), CusB (yellow), and MexA (blue). Rmsd values (Cα) are as follows: β-barrel domains, ZneB/CusB = 1.82 Å and ZneB/MexA = 3.40 Å; MP domains, ZneB/CusB = 1.40 Å and ZneB/MexA = 8.57 Å.