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. 2021 Jun 29;7(6):000614. doi: 10.1099/mgen.0.000614

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© 2021 The Authors

This is an open-access article distributed under the terms of the Creative Commons Attribution NonCommercial License. This article was made open access via a Publish and Read agreement between the Microbiology Society and the corresponding author’s institution.

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Fig. 3. — Phylogenetic classification of sialic acid transporters in bacteria. Global phylogenetic analysis of sialic acid transporters within expanded Pfam families. Clades highlighted in blue are sialic acid transporter sequences that reside in verified nan clusters. Among the diverse MFS_1 and ABC (SBP_bac_1 – cluster D SBPs) families, we observe independent evolutionary origins. In contrast, in the SSS, TRAP, MFS_2 and ABC (SBP_bac_5 – cluster C SBPs) families appear each to have only single ST origins.