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Metabolic compounds extracted from the cell wall of tobacco stems. (a) Lignin content in protein-free cell walls (PFCWs). (b) Cellulose content is equivalent to the glucose standard. (c) Total phenolic compounds equivalent to gallic acid. (d) Reducing sugars extracted from the cell wall. Asterisks (***) indicate statistical differences between treatments using the Student’s t-test (p <0.001); (n = 10 ± SE).
