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Surface acoustic wave nebulization (SAWN) tandem mass spectrometry (MSn) of Salmonella minnesota lipid A (shown in Figure 2) fragment ions: (A) MS2 of 1716, (B) MS3 of 1488, and (C) MS4 of 1244 where (D) is the structure of mono-phosphorylated hexa-acyl ion and fragmentation sites.
