Fig. 4.

SoxF factors are required for NOTCH1+16 activity. (A) Four representative whole-mount E12 X-gal-stained embryos transgenic for the NOTCH1+16mutSOX-a/b construct. Numbers at the bottom left indicate the unique embryo identifier. (B) Transverse sections taken from two NOTCH1+16mutSOX-a/b embryos demonstrate the very limited endothelial expression detected in these embryos (asterisks). In each case, the section to the left is through the head region, the section to the right is through the upper torso region.