Figure 3.

No hyperplasia of choroid epithelial cells was detected in the caffeine-treated rats. A. Representative photographs of BrdU immunohistochemistry in the choroid epithelial cells of the control and caffeine-treated rats (n = 4). BrdU incorporation into choroid epithelial cells was very rare. BrdU incorporation was indicated by arrows. Scale bar, 100 μm. B. Frequency of BrdU-positive cells in choroid epithelial cells. Values are expressed as the percentage of BrdU-positive cells (n = 4).