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. 2021 Jun 23;12:682605. doi: 10.3389/fmicb.2021.682605

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Copyright © 2021 Christakis, Barkay and Boyd.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The mer detoxification system. (A) A generic mer operon. (B) The cellular mer-encoded mercury detoxification mechanisms. The outer cell wall is depicted by a broken line illustrating that not all microbes have an outer membrane; broken line arrows depict diffusion; solid line arrows indicate transport or transformations; L = ligand with subscripts denoting the ligand type. The colors of various Mer proteins correspond with the colors of the genes that encode these proteins in panel A. Figure adapted from Lin et al. (2011); Boyd and Barkay (2012).