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(a) The positive ion ESI-MS mass spectrum of a lipid extract obtained from a 50 year-old, cataractous human lens recorded as a m/z 184 precursor ion scan and thus showing only the [M+H]+ molecular ions of sphingomyelin, dihydrosphingomyelin and phosphatidylcholine lipids present within the extract. (b) The OzESI-MS spectrum of the same extract recorded under the same conditions except for the presence of ozone in the desolvation gas.
