Summary: Among 28 mycobacterial species studied, only and produced waxes yielding long-chain β-diol components (called phthiocerol and companions) and polymethyl-branched fatty acids on saponification. The same mycobacterial species also produced diesters of phenol phthiocerol and companions. Fatty acids esterifying these fatty alcohols in and were found to belong to the phthioceranic series (dextrorotatory fatty acids), in contrast to those of the other species (laevorotatory fatty acids called mycocerosic acids), both groups having the same chain length and methyl-branched positions. and contained the same waxes with identical structures, as did and Neither the type strain of , nor that of or accumulated the strain-specific phenolic glycolipids.


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