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. 2022 Mar 24;10:862007. doi: 10.3389/fchem.2022.862007

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Copyright © 2022 Liu, Lu, Jiang, Zhang, Li, Qian and Bai.

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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The TOF-SIMS spectra of CCS and NCS samples in negative mode. (A) The representative spectra of CCS (No. 4 in red) and NCS (No. 14 in blue) samples. (B) Identification of amino acids (AAs) in the magnified region with m/z value from 70 to 210. (C) Assignment of fatty acids in the magnified region with m/z value from 100 to 400. The TOF-SIMS spectra were normalized by PID.