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Fig. 1. Retinal progenitor proliferation declines between P4 and P12. Rats were
injected every 3 hours for 9 hours with BrdU on the postnatal day indicated.
At P4 (A), BrdU-positive cells can be found centrally and peripherally in both
the INL and ONL (inset). By P6 (B), few or no cells incorporate BrdU in the
central retina; (B, inset), however, BrdU-positive cells can be found in the
peripheral regions (asterisks). At P8 (C), BrdU incorporation is restricted to
the periphery. By P10 (D), some BrdU labeling can be found at the margin
(arrow). At P12 (E), there is no BrdU labeling within the retina (arrow marks
the retinal margin). ONL, outer nuclear layer; INL, inner nuclear layer; GCL,
ganglion cell layer. Scale bar: 200 µm.