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Expression of Nkx2.5 in Nkx2.6−/− embryos. (A) Expression of Nkx2.5 in a wild-type (WT) embryo at E9.5. Nkx2.5 is expressed in the pharyngeal floor. Note the absence of Nkx2.5 transcripts in the pharyngeal pouches (arrows). Scale bar = 100 μm. (B and C) Expression of Nkx2.5 in Nkx2.6−/− embryos at E9.5. Note the ectopic expression of Nkx2.5 in pharyngeal pouches (arrows). Scale bars = 100 μm.
