(A) Transverse sections of wild-type and Dyrk2-/- embryos at E10.5 (at the branchial level) were stained for markers of ventral (FOXA2, NKX2.2, OLIG2, and NKX6.1) and dorsal (PAX6) regions. Nuclei were stained with DAPI (blue). (B) qPCR of Gli1, Ptch1, Shh, and Foxf2 in the whole embryos from wild-type and Dyrk2-/- embryos at E9.5. Data are presented as the means ± SEM (n = 3 biological replicates). The statistical significance between wild-type and Dyrk2-/- was determined by the Student’s t-test. (*) p<0.05, (**) p<0.01. (C) In situ hybridization of Ptch1 in the neural tube (left panels) and mandibular arch (right panels) in wild-type and Dyrk2-/- embryos at E10.5 from the transverse and sagittal plane, respectively. Scale bars, 50 µm.