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Structural components of the stalks of mature fruiting bodies of Dictyostelium discoideum have been isolated and characterized after solubilizing non-structural components with urea and sodium dodecyl sulfate. The urea/sodium dodecyl sulfate-insoluble stalks are composed of about 52% cellulose, 15% protein and 3% of a non-cellulosic heteropolymer in a covalently bound matrix. Non-covalently bound fatty acid containing material was also found. The composition and structural interrelationships of these components are essentially identical to that of the urea/sodium dodecyl sulfate-insoluble surface sheath which is produced earlier in development before culmination. These results suggest that the same components are involved in making structural elements which differ substantially in their functional role in the developmental sequence as well as in their spatial and temporal localization and morphological appearance.
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