Subcellular localization of GAPDH isoforms by stable expression of GFP-GAPDH fusion proteins in Arabidopsis. A and B, Localization of chloroplastic and cytosolic isoforms GAPA1 and GAPC1. C and D, Chloroplastic/plastidic localization of GAPCp1 in leaves (C) and roots (D). E and F, Chloroplastic/plastidic localization of GAPCp2 in leaves (E) and roots (F). GFP fluorescence, chlorophyll fluorescence, light image, and merged image are presented from left to right. Bars = 50 μm.