TET2 (Tet Methylcytosine Dioxygenase 2): TET2 is an enzyme that catalyzes the conversion of 5-methylcytosine to 5-hydroxymethylcytosine in DNA. This function is crucial for active DNA demethylation, which is vital for regulating gene expression, directing cellular differentiation, and preserving genomic stability. Mutations in TET2 are commonly found in hematologic cancers, including myelodysplastic syndromes and acute myeloid leukemia, underscoring its importance in epigenetic regulation and cancer development.