arabinogalactans

Plant cell-wall polysaccharides containing predominantly arabinose and galactose. Two main types are recognized: arabinogalactan 1, found in the pectin portion of angiosperms and containing a (1-4)-linked galactan and a -arabinose side-chains; arabinogalactan II, a highly branched polymer containing b (1-3)- and b (1-6)-linked galactose and peripheral a -arabinose residues. Arabinogalactan II is found in large amounts on some gymnosperms, especia … ...
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