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. 2020 Nov 11;7:583587. doi: 10.3389/fmolb.2020.583587

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Copyright © 2020 Chong, Tan and Tan.

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 alignments of NS-CTX and NK-CTX, visualizing P-type and S-type cytotoxins. Arrow in red indicates the Proline³⁰ of P-type cytotoxin; blue arrow indicates the Serine²⁸ of S-type cytotoxin.