label: protein-arginine omega-N symmetric methyltransferase activity
label_lc: protein-arginine omega-n symmetric methyltransferase activity
description: "Catalysis of the addition of a second methyl group to methylated peptidyl-arginine. Methylation is on the terminal nitrogen (omega nitrogen) residue that is not already methylated, resulting in symmetrical peptidyl-N(omega),N'(omega)-dimethyled arginine residues."