TET2 (Tet Methylcytosine Dioxygenase 2): TET2 is an enzyme that catalyzes the conversion of 5-methylcytosine to 5-hydroxymethylcytosine in DNA. This activity plays a key role in active DNA demethylation, which is essential for regulating gene expression, guiding cellular differentiation, and maintaining genomic stability. Mutations in TET2 are frequently observed in hematological malignancies, including myelodysplastic syndromes and acute myeloid leukemia, highlighting its role in epigenetic regulation and cancer development.