TET1 (2 of 2) (IMAGE) University of Copenhagen Caption Genes that protect against cancer, so-called tumor suppressor genes can be found in normal blod cells. The TET enzymes turn these genes on by removing methyl groups from the genes. In blod cancer cells, TET2 is often mutated and cannot remove methyl groups from the protective genes, why the genes are shut off. Credit Kristine Williams, BRIC, University of Copenhagen Usage Restrictions Graphic can be used when crediting Kristine Williams, BRIC, University of Copenhagen License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.