Figure 5. Expression of Wnt3a and Dll1 in wild type and T^Wis/T^Wis embryos at E8.0.

A–F: Left lateral (A, D), posterior (B, E), and ventral (C, F) views of the distal tip of wild type and T^Wis/T^Wis embryos showing similar Wnt3a expression throughout the entire primitive streak (double arrows); arrowheads point to the node in ventral views. G–L: Left lateral (G, J), posterior H, K), and ventral (I, L) views of Dll1 expression in the presomitic mesoderm and perinodal region in wild type embryos and greatly reduced expression in T^Wis/T^Wis mutants, particularly in the presomitic mesoderm. AL, allantois; HF, headfold. Arrowheads point to the node in ventral views.