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Expression of regulators of the flavonoid pathway was examined in Arabidopsisthaliana wild type and pap1D plants, the latter being a T-DNA activation-tagged line over-expressing the PAP1/MYB75 gene which is a positive regulator of the pathway. Anthocyanin accumulation was induced in plants grown in soil, on agar plates, and hydroponics by withdrawing nitrogen from the growth medium. The agar-grown...