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Chlorophenol red dye assay for PMI activity in shoot tip (a), young leaf (b), and root (c) sections of sugarcane. Non-transgenic control plants from seed-cane (wt) and tissue-cultured (tc) plants; transgenic lines (tp-29, tp-13, and tp-7). Red/purple color in medium indicates little or no PMI activity; yellow/orange in medium indicates enzyme activity. (Color figure online)
