Concentration of individual species of phosphatidyl-ethanolamine (PE) and plasmenyl- ethanolamine (PlsE) in erythrocytes from controls and diabetic patients without or with mild, moderate, severe or proliferative diabetic retinopathy (results are expressed as µg of mg phospholipids for PE species a

[M+H]+ for PE species and MS/MS transition for PlsE species. Abbreviations of individual PE and PlsE species are as follows: position on the glycerol backbone as shown as sn-1/sn-2 of the fatty acid and fatty alcohol radicals (abbreviated as number of carbons: number of double bonds). aBased on Kruskall-Wallis test, significantly different when compared to controls (P<0.05). Concentration of individual species of phosphatidyl-ethanolamine (PE) and plasmenyl- ethanolamine (PlsE) in erythrocytes from controls and diabetic patients without or with mild, moderate, severe or proliferative diabetic retinopathy (results are expressed as µg of mg phospholipids for PE species and as ratio to internal standard PC14∶0/14∶0 for PlsE species).