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Fig. 5. Hematoxylin and eosin staining and TUNEL assay reveal abnormal
triangular areas and a lack of apoptosis in the Apaf1 mutant
palate. (A) An E15.5 wild-type palate showing a normal triangular
area (arrow). (B) An E15.5 Apaf1 mutant palate containing an
enlarged and highly compacted triangular area (arrow). (C) Apoptotic
cells were visualized by TUNEL assay in the triangular area of the wild-type
palate at E15.5 (arrow). (D) No TUNEL-positive cells were detected in
the triangular area of the Apaf1 mutant palate at E15.5 (arrow).