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RNA gel-blot analysis showing the expression of transcripts encoding the reactive oxygen-scavenging enzymes CAT1 (At1g20630), APX1 (At1g07890), AOX1 (At3g22370), FSD1 (At4g25100), and CSD1 (At1g08830) in the wild type (wt) and thiamin auxotroph mutants py and tz. Total RNA was extracted from whole plants grown in 100 μmol m−2 s−1 constant light. Ribosomal RNA was used to control for RNA loading.
