L-lysyl(4)-[histone H3] + formaldehyde + AH2 => N(6)-methyl-L-lysyl(4)-[histone H3] + A + H2O
l-lysyl(4)-[histone h3] + formaldehyde + ah2 => n(6)-methyl-l-lysyl(4)-[histone h3] + a + h2o
L-lysyl(4)-[histone H3] + formaldehyde + AH2 => N(6)-methyl-L-lysyl(4)-[histone H3] + A + H2O
l-lysyl(4)-[histone h3] + formaldehyde + ah2 => n(6)-methyl-l-lysyl(4)-[histone h3] + a + h2o