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Brain PC imaged by MALDI mass spectrometry. Mass spectral imaging of a 10 μm mouse brain slice (mid-sagittal section) for a docosahexaenoic acid–containing phosphatidylcholine (18:0/22:6-PC) as a positive ion at m/z 834.6 using MALDI mass spectrometry. The highest ion intensity (brightest shade) was observed in the cerebellar gray matter (see ref. 31 for methods). c.p.s., counts per second.
