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All Beijing sublineages accumulate triglycerides. Apolar lipids extracted from [1-14C]propionic acid-labeled in vitro cultures of the Beijing and non-Beijing strains indicated were analyzed on silica gel TLC plates developed in petroleum ether-acetone (96:4). Radiolabeled lipids were subsequently visualized by phosphorimaging. The position of the triglyceride fraction specific to all Beijing strains is shown. PDIM, phthiocerol dimycocerosate.
