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A. Mesophyll cell structure; B. Chloroplast structure; C. Grana lamella structure; D. Number of chloroplast and starch granule per cell. cp, chloroplast; sg, starch granule; g, grana; thy, thylakoid. * or **represents a statistically significant difference of p<0.05 or 0.01, respectively, when compared to that of control.
