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Relative expression levels of PALs and KFBs in Arabidopsis exposed to UV light. Five-week-old Arabidopsis was illuminated with cool-white fluorescent light supplemented with UV-B radiation from an FS20-UVB lamp (0.2 J m−2 s−1) for 12 h. The error bars represent sd from three biological repeats. The expression level in untreated samples (black bars) was set at 1.
