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Changes in leaflet morphology of the BR-deficient lkb mutant in response to BL application. A total of 200 ng of BL in 2 μL of ethanol was applied to the upper surface of the leaflet only. The treated leaflet is indicated by the arrow. Control plants were treated with 2 μL of ethanol only. BL-treated and untreated leaflets were photographed 4 d after BL application.
