Lpaatδ deficiency reduces the abundance of specific ethanolamine-type phospholipids in brain mitochondria. Shown are the specific fatty acyl composition of brain mitochondrial phosphatidylcholine (A), 72:8 CL (B), 18:0/22:6 PS (C), phosphatidylethanolamine (D), lysophosphatidylethanolamine (E), and plasmenyl phosphatidylethanolamine (PPE) (F) species from wild-type or Lpaatδ−/− mice as the abundance of the analyte relative to the internal standard. The data are means ± SEM (n = 4). *, P < 0.05; ***, P < 0.001 versus the wild type.