Whole mount (A-D) and histological (A’-D”’) expression of trpv1 transcripts in developing X. laevis embryos. (A-B) dorsal view, (C-D) lateral view, anterior to the right for all whole mount embryos; dorsal to the top for all histology images. (A, A’, A”) stage 20 (late neurula stage); (B, B’, B”) stage 25 (early tailbud stage); (C, C’, C”) stage 30 (late tailbud stage); (D, D’, D”, D”’) stage 35 (swimming tadpole stage). Arrows indicate regions of gene expression (nt, nural tube; sc, spinal cord; tg, trigeminal ganglia). Dashed lines represent positions of corresponding sections. Scale bars = 250µm.