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Figure S2.The expression of Dll1 was not affected in FoxN1-Cre:Dll4-floxed mice. Epithelial cells in the thymus were identified by the expression of cytokeratin (CK, green) with Dll1 (red). (right) High magnification images of the red boxed areas shown in the middle images. Bars: (left and middle columns) 50 μm; (right column) 10 μm. Goat anti-Dll1 Ab was purchased from Santa Cruz Biotechnology.