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Gas chromatograms of lipids released after acid hydrolysis of whole-cell material of P. methylaliphatogenes K22T (a) and Aridibacter famidurans A22_HD_4HT (b). Carboxylic groups were derivatized to the corresponding methyl esters, and alcohol moieties were derivatized to trimethyl silyl ethers prior to gas chromatographic analysis. Numbers refer to structures shown in Fig. 1.
