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X - gal staining in Pax2-Cre/DicerloxP/WT/Rosa26R (a-c) and Dicer1 CKO (d) mice. MHB: mid-hindbrain; PS: palatal shelf; NC: nasal cavity; NS: nasal septum; PP: primary palate; SP: secondary palate. Bar = 50 μm (a, b); 1mm (c, d). Palatal rim delineated by dotted line
