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BrdU staining in wild type (A) and Bmp4CKO embryos at E10.5 (B). The BrdU labeling index decreased markedly in the prospective retina of Bmp4CKO embryos to levels at or below those seen in wild type RPE cells (C). For all sections, dorsal is to the left. R, Retina; RPE, retinal pigmented epithelium; PR, prospective retina.
