Fig. 5

Concentrations of phosphatidylethanolamine-based plasmalogen (PE P) species in serum. ESI-MS/MS quantification in serum samples from controls (n = 31, blue) and early stage OA (eOA, n = 29, yellow) and late stage OA (lOA, n = 29, grey) patients. (A) Fatty acids (FA) with 16 carbon atoms. (B) FA with 18 carbon atoms. (C) FA with 18 carbon atoms with 1 double bond. For more information, refer to caption of Fig. 2