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BrdUrd labeling of hippocampus at P18 from (A) wild-type, (B) Ink4d–null, (C) Kip1-null, and (D) Ink4d, Kip1 double-null mice. Note prominent labeling in D ca1. CC, corpus callosum; DG, dentate gyrus; ca1 through ca3, corpora Ammon’s sectors 1–3. Bar for all figures (shown in D) = 200 μm.
