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. 2021 Nov 17;22(22):12393. doi: 10.3390/ijms222212393

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(a) MALDI OzID spectrum of [PC (36:1) + Na]⁺ ions revealing the presence of n-9 and n-7 db isomers, (b) The corresponding full-scan FTMS image of the [PC (36:1) + Na]⁺ ion (m/z 810.5994) and (c) fractional distribution image of n-7 and n-9 isomers (n-7)/(n-7 + n-9) showing an enrichment of the n-7 isomer in the gray matter. (d) Graphs show the n-7 and n-9 relative isomer percentages for PC (36:1). Error bars represent the coefficient of variation from each region (n = 5 each for white and gray matter regions) [102].