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Fig. 6. Compromised BMP4 signaling in Frs2
mutant
embryos. (A) Whole-mount in situ hybridization with antisense
Bmp4 probe on E9.5 (a-c) or E10.5 (d-f) mouse embryos. Sections (g-l)
confirm the decreased Bmp4 expression in the
Frs2
cn OFT and pharyngeal arches.
(B) Phosphorylated SMAD1/5/8 expression assessed in E9.5 embryos.
High-magnification views of boxed areas in b,d are shown in
b',b'',d',d'',as indicated.