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Product-ion spectrum of m/z 766.5 in positive mode from isobaric species PE(18:1,20:4) and PC(18:1/17:4) obtained using one-dimensional RPLC-MS/MS where both species co-elute (A) and off-line two-dimensional mixed mode LC-RPLC-MS/MS in PE (B) and PC (C) fractions of rat plasma lipid extract.
