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Fig. 6. Hypothetical models for cell differentiation and migration in chick embryo retina. (A) In the current model for retinal development cells migrate directly to their final lamina. (B) In the model suggested by this work, HCs migrate bi-directionally across the neuroepithelium before attaining their final position. Numbers denote developmental stages. PR: photoreceptors, HC, horizontal cells; BP, bipolar cells; AC, amacrine cells; RGC, retinal ganglion cells; GCL, ganglion cell layer.