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Mass spectra of intact lipids acquired from mouse brain tissue using high-energy Ar cluster SIMS (a) and NP-LDI (b) in negative ion mode (peak intensity is normalized to the maximum intensity (×100) in the range m/z 700 to m/z 925). The strong peak in the NP-LDI spectrum between m/z 775 and m/z 800 is Au4 −
