W the limit of detection ( LOD), below the lowest calibration standard ( LLOQ), or quantified based on a ratio to a class-based internal standard (semiquantitative). Each analyte was normalized for the total protein in the sample, concentrations shown in supplemental Table S5. Oxylipin Assay of Middle Ear Mucosae-- Preparation of Oxylipin Standards--Stable isotope labeled (SIL) oxylipin standard s