to gain a better understanding of the role these oncogenes may play in malignant transformation , we evaluated the levels of a ras gene protein product ( p21 ) in formaldehyde-fixed , paraffin-embedded specimens of normal human colonic mucosa , hyperplastic polyps , tubular adenomas , villous adenomas , and epithelium from a patient with ulcerative colitis .
C0334292
tubular adenomas
C0014609
epithelium