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. 2019 Apr 5;10:704. doi: 10.3389/fmicb.2019.00704

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Copyright © 2019 Wang, Guan, Zhang, Chen and Li.

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.

PMC Copyright notice

Signature sequence logos of Δ^4,5hexuronate-2-O-sulfatases. Signature sequence logos of Δ^4,5hexuronate-2-O-sulfatases were created with the WebLogo online server (http://weblogo.threeplusone.com/). The numbers below the logo sequences indicate, at the first position, the corresponding positions of the PB2SF protein sequence. The positions of signature sequences (A–E) in the structural model of PB2SF are indicated in pink, purple, green, yellow, and blue, respectively. The five-pointed star indicates the position of the key residue Cys92.