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RUNX3 binds to the core site, 5'-PYGPYGGT-3', of a number of enhancers and promoters, including murine leukemia virus, polyomavirus enhancer, T-cell receptor enhancers, lck, IL-3 and GM-CSF promoters. RUNX3 consists of a heterodimer of an alpha and a beta subunit. The alpha subunit binds DNA as a monomer through the Runt domain. DNA-binding is increased by heterodimerization.