ER pattern and small PBs in leaf tissues of cv. I64 expressing ER-targeted GFP. A-C. Leaf cells from cv. I64 plant 18 with GFP accumulation at 0.35% of TSP. Puzzle-shaped epidermal cells (ec) are revealed by GFP fluorescence in the ER. The ER also surrounds the nucleus (n) which appears as circles inside epidermal cells. B. Close-up of (A) showing the reticulated pattern characteristic of the ER. C. Small PBs in another cell of cv. I64 plant 18. D. Small PBs in cv. I64 plant 24 (1.2% TSP).