Min Kyoung You identified the subcellular localization of sGFP using a confocal microscope, participated in the expression and flow cytometry analyses, and wrote the manuscript. Sun-Hyung Lim participated in the western blot analysis of sGFP, and wrote the manuscript. Min-Jin Kim participated in experiments involving rice protoplast preparation, the confocal microscopy, and the hemocytometer measurements. Mi-Gi Lee participated in the flow cytometer analyses. Ye Sol Jeong participated in the operation of real-time PCR. Sun-Hwa Ha conceived and designed this study and wrote the manuscript. All authors read and approved the final manuscript.