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Most of the hydroxyproline in Chlamydomonas reinhardtii is glycosidically linked to oligosaccharides and a monosaccharide that are different from the arabinosides found in hydroxyproline-containing plant cell walls previously examined. Of particular interest is the presence of hydroxyproline-O-galactose. These differences may be common to the volvocalean green algae and may be related to lower tensile strength of the cell walls of this group of plants.
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