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Subcellular distribution pattern of AtPRA1 proteins over ER in stable transgenic Arabidopsis root cells. A, Negative and positive control seedlings harboring the vector CaMV 35S:GFP and the ER marker tagged to GFP, respectively. The adopted ER marker corresponds to a chimeric fusion of the signal peptide AtWAK2 and the HDEL retention signal to the fluorescent marker gene. B, The four AtPRA1 proteins showing ER localization. Bars = 10 μm.
