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Differentiation of W12 cells in monolayer culture. Western blot analysis with antibodies against the differentiation-specific proteins (A) involucrin (cellular), (B) E1^E4, and (C) L1 (viral) of W12E, W12G, and HaCaT cells grown in high-Ca2+ medium and harvested after 5 (D5) or 10 (D10) days in culture.
