. "The name protein methylase I is misleading since it has been used for a number of enzymes with different specificities." . "Forms the N(omega)-monomethyl-and N(omega),N(omega')-dimethyl, but not the N(omega),N(omega)-dimethyl-arginine derivatives." . . . "Protein methylase I" . "Histone-arginine N-methyltransferase" . "Protein-arginine N-methyltransferase" . "Histone protein methylase" . . "S-adenosyl-L-methionine + arginine-[histone] = S-adenosyl-L-homocysteine + N(omega)-methyl-arginine-[histone]." .