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β-glucanase expression phenotypes of single and double mutants. Mutants npr1, dnd1 npr1 and dnd2 npr1 carry the BGL2 promoter region fused to the β-glucuronidase reporter gene. (A) Constitutive expression of BGL2::GUS in leaves of non-inoculated dnd1 and dnd1 npr1 plants. (B) Constitutive expression of BGL2::GUS in non-inoculated dnd2 and dnd2 npr1 plants.
