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Cross sections through the first branchial arch shows robust TUNEL positive cells in the cranio-facial regions in N629D/N629D E9.5 embryos (Panel C and D) is compared to +/+ embryos (Panel A and B). The arrow indicates the first branchial arch artery. Cross sections through the heart show TUNEL positive cells sporadically in the N629D/N629D heart (bottom right panel). Apoptotic cells in the +/+ hearts were more rarely seen (bottom left panel).
