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Fig. 2 | BMC Evolutionary Biology

Fig. 2

From: Reiterative use of FGF signaling in mesoderm development during embryogenesis and metamorphosis in the hemichordate Ptychodera flava

Fig. 2

FGF receptor genes are expressed in mesodermal cells. In situ hybridization of fgfra1 (A1-A5), fgfra2 (B1-B5) and fgfrb (C1-C5) at different embryonic stages. The embryos are shown from a lateral view and oriented with the mouth to the left. Red arrows in A5 and B5 indicate the expression in the sphincter. Blue arrows in C4-C5 indicate ectodermal fgfrb expression domains. Black asterisks mark the hydropore in A5-C5. The expression patterns of the FGF receptor genes in the developing mesodermal cells and other embryonic territories are summarized schematically at the corresponding stages in D1-D4. All panels are shown at the same scale, according to the scale bar in A1

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