Osr2-IresCre;Smoc/c mutant embryos exhibited defects
in palatal shelf growth at E13.5. Frontal sections through the palatal
regions of BrdU-labeled Osr2-IresCre;Smo+/c
(A,D) and Osr2-IresCre;Smoc/c mutant
(B,E) embryos were stained with anti-BrdU antibody. The labeled
cell nuclei were stained blue. The white line in each panel divided each image
of the palatal shelf to medial and lateral halves for the calculation of the
percentage of BrdU-labeled nuclei in those regions separately. A and B show
typical sections through the middle of the anterior half of the palatal
shelves, whereas D and E are from the posterior third of the palatal shelves.
(C,F) Comparison of the percentage of BrdU-labeled cells in the
anterior (C) and posterior (F) regions of the developing palate in the
Osr2-IresCre;Smo+/c (control) and
Osr2-IresCre;Smoc/c (mutant) embryos. Standard deviation
values were used for the error bars. An asterisk denotes a significant
reduction in the percentage of BrdU-labeled cells in the mutant
(P<0.05). p, palatal shelf.