Oxidized fatty acid metabolites from murine hepatic tissue were extracted into solvent, isolated by solid phase extraction, derivatized with AMPP and quantitated by LC/MS/MS via selected reaction monitoring (SRM) in the positive ion mode following separation of molecular species using a reverse phase column as described in “Materials and Methods”. Significant decreases in the production of multiple identified oxidized metabolites of LA, DHA and AA as a result of genetic ablation of iPLA2γ are displayed in panels A, B and C, respectively. Values presented are the mean ±S.E. and comparisons were made using Student’s t-test (n=4). *: P< 0.05 level, **: P< 0.01 level.