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. 2021 Feb 3;7:607323. doi: 10.3389/fmolb.2020.607323

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Copyright © 2021 Jernigan, Sankar, Jia, Faraggi and Kloczkowski.

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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Distribution of the 129 HA monomeric structures projected onto the first 3 PCs. (Left) PC2-PC1 space and (Right) PC3-PC1 space. PC1 separates the Group 1 and Group 2 hemagglutinins into different clusters. Outliers H13 and H16 have been eliminated from the figure for the sake of clarity. PC1 has a major gap between the two groups of clustered structures. PC3 appears to be populated in two somewhat similar clusters, with Group 1 showing a particularly wide range of PC3 values.