psoriasis embryos fail to cease epidermal proliferation at 80 hours postfertilization (hpf). A-C: The epidermis of wild-type embryos is 5′-bromodeoxyuridine (BrdU) -negative (B) at 80 hpf, indicating cessation of epidermal proliferation late in embryogenesis. D-F: Epidermal cells in psoriasis mutants are BrdU-positive at 80 hpf (E). G-I: The level of proliferation observed in psoriasis embryos is similar to that observed in 48 hr wild-type embryos (H). Anterior is to the left. Brightfield images are shown in A, D, and G, BrdU-positive cells are green in B, E, and H. C, F, and I are merged brightfield and fluorescent images. J: Quantification of cell proliferation at 48, 60, and 72 hpf. Scale bars = 50 μm.
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