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A galactomannan containing D-galactose (16%) and D-mannose (84%) has been isolated from the water-soluble polysaccharides of Trichophyton granulosum. Methylation studies showed that the structure was highly branched, the predominant structural feature being a chain of α-D-mannopyranose units joined together by an equal number of 1 → 2 and 1 → 6 linkages. About 22% of the D-mannose units were doubly substituted at positions 2,6; 2,4; and 2,3 to form branch points. The branches were terminated by D-mannopyranose and D-galactofuranose residues, the latter accounting for all of the D-galactose present in the polysaccharide.
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Bishop et al. (1962) studied this question.
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