Growth of a Mycobacterium avium complex serotype 20 rough-colony variant in 1.0% Tween 80 resulted in a smooth-colony morphological conversion that was reversible upon removal of Tween and was not associated with the presence of serotype-specific glycopeptidolipid antigens. Electron microscopic examination suggested the role of an outer layer in the Tween-related morphological modification.
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Wright et al. (1992) studied this question.
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