For detection of the green fluorescent protein (GFP) fusion protein in RXR3 complementation plants, total protein was extracted as described previously (Ying et al., 2022 (link)). Equal amounts (30 µg) of each sample were separated by sodium dodecyl sulphate‐polyacrylamide gel electrophoresis (SDS‐PAGE), transferred into Immobilon‐P PVDF membrane (0.45 μm; Millipore Sigma) and probed with 1/5000‐diluted monoclonal mouse anti‐GFP horseradish peroxidase (HRP)‐conjugated antibody (Miltenyi Biotec). Chemiluminescence detection was performed with ECL™ Prime Western Blotting System (Millipore Sigma) and UVP ChemStudio imager (Analytik Jena).