Fig. 4. A higher level of ß-catenin in nuclei of the hypostome (A,B) compared with nuclei of the body column (C,D). (A,C) Staining with the anti-ß-catenin antibody; (B,D) staining with propidium iodide. The intense horizontal lines of stain are in the membranes of processes extending from the epithelial cells along the basement membrane.