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. 2022 Jun 14;13:888833. doi: 10.3389/fmicb.2022.888833

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Copyright © 2022 Du, Gao, Wang, Liu, Cheng, Liu, Zhang and Yu.

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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Multiple sequence alignment of the TsdA (A) and TsdB (B) in Halomonas titanicae SOB56 and related organisms. Protein secondary structures were shown on the top of sequences. Referred crystal structures of TsdA and TsdB were from Allochromatium vinosum 180 (PDB code: 4WQ7) and Marichromatium purpuratum 984 (PDB code: 5LO9), respectively. Heme-binding motifs are indicated by gray boxes, and putative distal heme ligands are marked by black squares. Strictly conserved residues are marked with bold font in sequences.