N(6)-methyl-L-lysyl-[histone] + S-adenosyl-L-homocysteine + H(+) => L-lysyl-[histone] + S-adenosyl-L-methionine
n(6)-methyl-l-lysyl-[histone] + s-adenosyl-l-homocysteine + h(+) => l-lysyl-[histone] + s-adenosyl-l-methionine