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Fig. 5. Mesodermal Tbx1 affects mesodermal but not epithelial
Fgf8 expression. (A-D) Whole-mount RNA in situ
hybridization with an Fgf8 probe. (A',B') Transverse
sections of the E8.5 embryos shown in A and B, respectively.
(C',D') Coronal sections of the E9 embryos shown in C and D,
respectively. Orange arrows indicate Fgf8 expression in the ectoderm.
Pink arrows indicate Fgf8 expression in endoderm. Black arrowheads
indicate Fgf8 expression in splanchnic mesoderm/anterior heart field.
Scale bar: 100 µm in B,D,D'; 50 µm in B'.