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Cell wall thickness and lignin content increase in rind tissues of maize internodes with developmental age. Phloroglucinol staining intensity increases from faint pink to dark red in stem sections from (A) an elongation stage internode (internode 8), (B) a transitional stage internode (internode 6), and (C) a secondary wall stage internode (internode 4). Scale bar, 1 mm.
