Fig. 4. Xanx-4 protein is localised to the luminal surface of the pronephric tubules. Whole-mount (A) and section (B) stage 40 embryos stained with anti-Anx-4 antibody show that Xanx-4 protein is specifically localised to the pronephric tubules and in section to the apical surface of the pronephric tubule epithelium.