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Representative scheme of DAG-like artifacts arising from in-source fragmentation of sodiated TAG counterparts in the positive-ion mode of MALDI-MSI. There is no selective dissociation of a certain fatty acyl chain at the sn-1, −2 or −3 position of the glycerol moiety when the fatty acyl chains are similar in their length and degrees of unsaturation. DAG and TAG represent diacylglycerol and triacylglycerol, respectively.
