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Lateral ventricle region of mouse brain (coronal section). a MS image, 3 μm pixel size, 170 × 300 pixels, green phosphatidylcholine PC (38:4), [M + K]+, m/z 848.5566. blue phosphatidylcholine PC (34:1), [M + K]+, m/z 798.5410, red background signal from ITO-coated glass slide. b Optical image of imaged area before measurement. c Mass spectrum acquired from a single 3-μm pixel
