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. 2017 Jul 28;7:6771. doi: 10.1038/s41598-017-06964-9

Figure 4.

Figure 4

In ovo blocking of the Fgf8 signal causes abnormal Sema3c expression and migration defects in cardiac neural crest cells. (A) Injection of Fgf8 neutralizing antibody (Fgf8ab) led to abnormal ectopic enhancement of SEMA3C expression in the pharyngeal arch region (white circle) in HH22 chick embryos. (B) SEMA3C mRNA expression in the pharyngeal arch region of HH22 chick embryos (control) and those injected with Fgf8ab (n = 6 per group). (C) Pharyngeal arch regions of chick-quail chimeras with bilateral transplantation of cNCCs. Fgf8ab injection causes less migration of cNCCs from the 6th pharyngeal arch region (white arrowhead) to the outflow tract (black arrowhead) compared to control. Thirteen chimeras and thirteen control embryos were analyzed. (D) India ink injection demonstrated hypoplasia of the 6th pharyngeal arch artery in Fgf8ab injected embryos (arrow) compared to control. v, ventricle; oft, outflow tract; III, IV and VI, 3rd, 4th, and 6th pharyngeal arch arteries, respectively; Paa, pharyngeal arch arteries. Scale bars, 500 μm. **p < 0.01. Error bars represent s.e.m.