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DESI–MSI spectra obtained from whole lip tissue of subject 1. (a) Full negative-ion mass spectrum from m/z 50−400. (b) Expanded view of the mass ranges from m/z 250 to 330 with molecular assignments. PA: palmitoleic acid; LA: linoleic acid; OA: oleic acid; AA: arachidonic acid; DHA: docosahexaenoic acid.
