Fig. 5
Pharyngeal arch size is reduced in polr1c-/- and polr1d-/- mutants.
(A-C) Immunostaining of 36hpf fli1a:egfp labeled control, polr1c-/- and polr1d-/- mutant embryos with Zn-8 (red), which labels the endodermal pouches, revealed comparatively normal pharyngeal arch and pharyngeal pouch patterning. Pharyngeal arches 1–5 are indicated. (D-F) fli1a:egfp labeling of post-migratory NCC illustrates an overall reduction in pharyngeal arch size in polr1c-/- and polr1d-/- mutants. Pharyngeal arches 1 and 2 are outlined in red. (G-H) Quantification of pharyngeal arches 1 & 2 (red arrows, D-F) volume revealed a reduction in polr1c-/- (G) and polr1d-/- (H) mutants. Scale bar = 100 μm. * = p < 0.05 and error bars represent 95% confidence intervals.