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Fig. 6. Progenitor cell populations are proportionally maintained across all genotypes. PCNA staining in (A) wild type, (B) Chx10-null and (C) Chx10, Kip1 double null retinas, shows that in each genotype the progenitor population size is commensurate with total retinal size at P0. Enlargements of each retina are shown in the insets. L, lens. Scale bar: 500 µm; 125 µm in inset.