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. 2020 Jul 25;412(25):6875–6886. doi: 10.1007/s00216-020-02818-y

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© The Author(s) 2020

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Fig. 5 — Signal intensity response from tissue in positive ion mode for different lipids. Values represent the average MALDI (a) or MALDI-2-MSI (b) signal intensity derived from the molecular concentration (nmol/mm³ of fresh frozen tissue) present in the tissue region for white matter (WM, red) and molecular layer (ML, blue). Average signal intensities derived from the sum of protonated, sodiated, and potassiated ion species