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. 2021 Apr 20;8:639166. doi: 10.3389/fmolb.2021.639166

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Copyright © 2021 Fernández-Quintero, Seidler, Quoika and Liedl.

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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Structural comparison of an immunoglobulin (IgG) structure with an IgG new antigen receptor (IgNAR). The structure of a V_NAR with its unique binding site geometry is depicted next to the IgNAR.