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Transcript analysis of ΔpsbA3 mutant under HL condition. The amount of psbA1 and psbA2 in the ΔpsbA3 mutant was determined relative to the housekeeping gene rnpB. Upon HL treatment, psbA1 is down-regulated, whereas psbA2 regulation is not affected, resulting in a minor D1 content in the ΔpsbA3 mutant under HL conditions. Data are presented as mean ± S.D. of three independent measurements. In some instances, the error bars are smaller than the symbols.
