PLD1 involvement in lipids metabolism. A) TLC lipid profiles of E. coli strain SD9 and SD9 + pPLD. Red circle indicates phosphatidyl glycerol. Blue circle represents the lipid present specifically upon pld1 expression. B) Mass spectrometry profiles of E. coli strain SD9 and SD9 + pPLD lipids. The red arrow points to m/z 789.4 exclusively found in wild-type strain. TLC, thin-layer chromatography.