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Recovery of a four-component phosphorylated lipid standard mixture using the IMAC ZipTip. Protonated 16:0-lyso phosphatidylcholine at m/z 496, protonated dimyristoyl phosphatidylcholine at m/z 678, protonated dipalmitoyl phosphatidylethanolamine at m/z 692, and protonated 16:0-sphingomyelin at m/z 731.
