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Positive ionization mode high-resolution (R = 100,000)/accurate mass spectrum of a modified Folch lower phase retina lipid extract (A) and the monophasic retina lipid extract (B) after sequential functional group selective derivatization of PE, PS, and plasmalogen lipids (sample concentration corresponding to 1.0 mg/ml of original retina tissue extracted). I.S., internal standard. PC(14:0/14:0) (0.5 μM).
