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. 2019 Mar 20;457(1):105–118. doi: 10.1007/s11010-019-03516-9

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 5 — Analysis of hydrogen bonds in CGA isomers that interacted with Keap1/Nrf2 complex. Bottom (a) and side (b) views of Keap1 β-propeller according to residue types. Blue, arginine; red, aspartic acid; green, glycine, serine, or threonine; white, valine, alanine, isoleucine or leucine. Hydrogen bonds between CGA isomer and Keap1 β-propeller (c) and intra-Keap1 β-propeller (d), and between Keap1 β-propeller and Nrf2 fragment (e). (Color figure online)