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. 2019 Jul 19;10:1642. doi: 10.3389/fmicb.2019.01642

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Copyright © 2019 Osorio, Mettert, Kiley, Dopson, Jedlicki and Holmes.

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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Cartoon of predicted domain structure of FNR_AF compared to FNR_EC. The four cysteines that coordinate the [4Fe-4S]²⁺ cluster at positions 20, 23, 29, and 122 in FNR_EC (Mettert and Kiley, 2007) are highlighted in yellow. Three of these cysteines are conserved in FNR_AF.