N(6)-methyl-L-lysyl(20)-[histone H4] + 2-oxoglutarate + O2 = L-lysyl(20)-[histone H4] + formaldehyde + succinate + CO2
n(6)-methyl-l-lysyl(20)-[histone h4] + 2-oxoglutarate + o2 = l-lysyl(20)-[histone h4] + formaldehyde + succinate + co2