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In vitro adult human donor retinal cells can be transfected using PEI. (A) and (B) show grayscale confocal microscopic images of retinal cells expressing EGFP. The two large cells to the right in (A) are glia, most likely astrocytes; the process-bearing cells on the left in (A) and in (B) are neurons. Scale bar = 17 μm in (A); 10 μm in (B).
