character: Hemicellulose
topic: Supportive Material in Cell Walls
grade: 9
subject: Science
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character: Cellulose
topic: Plant Cell Wall Structure
grade: 9
subject: Science
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character: Lignin
topic: Strengthening Agent in Cell Walls
grade: 9
subject: Science
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character: Pectin
topic: Cell Wall Polysaccharides
grade: 9
subject: Science
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