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Radio-GC analysis of the total fatty acid methyl esters derived from [1-14C]propionate in M. tuberculosis H37Rv (top) and its msl6 mutant (bottom). Retention time ranges for branched short-chain acids (A) mycolipanoic and mycolipenic acids (B), mycocerosic acids (C), and phthioceranic acids (D) are indicated.
