. "Catalysis of the reaction: S-adenosyl-L-methionine + (histone)-arginine = S-adenosyl-L-homocysteine + (histone)-N-methyl-arginine." . . . "histone-arginine N-methyltransferase activity" . "histone methyltransferase activity" . "histone protein methylase activity" . "histone protein methylase I" . "histone-arginine N-methylase activity" . "nuclear protein (histone) N-methyltransferase activity" . "protein methylase I activity" . "S-adenosyl-L-methionine:histone-arginine nomega-methyltransferase activity" . "S-adenosyl-L-methionine:histone-arginine omega-N-methyltransferase activity" . . . . . . . .