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BiFC assay in Nicotiana tabacum protoplasts. CaHAI fused with the C-terminus of YFP (cYFP) was cotransformed into protoplasts, respectively, with CaPYL2 and CaPYL4 fused with N-terminus of YFP. Chlorophyll autofluorescence, YFP fluorescence and merged images are shown in the presence or absence of ABA. Scale bars = 20 μm in all panels.
