Feulgen stained nuclei of epithelial cells. (A) Nuclei of epithelial cells showing a normal diploid nuclear content. (B) Feulgen stained nuclei of malignant epithelial cells found in the urine smear of a chronic urinary bilharziasis patient. The nuclei show aneuploid DNA content with high proliferation pattern with 100× and 400× magnification for A&B respectively. (C & D) Feulgen-stained nuclei of epithelial cells from tissue sections of a biopsy sample showing bilharzial associated carcinoma.