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Fractionation of cell wall components from young and old Zygnema S and Klebsormidium crenulatum filaments into six classes. Classes are shown as percentages of total alcohol-insoluble residue (AIR). n=3 (s.d. <5%). Zyg. S, Zygnema S; Klebs., Klebsormidium. Young filaments are 1 month old; old filaments are 12 months old.
