Catalysis of the addition of a methyl group to either of the unmethylated terminal nitrogen atoms (also called omega nitrogen) in peptidyl-arginine to form an omega-N-G-monomethylated arginine residue. The reaction is S-adenosyl-L-methionine + [protein]-L-arginine = S-adenosyl-L-homocysteine + [protein]-Nomega-methyl-L-arginine. [EC:2.1.1.321, PMID:14705965, RESID:AA0069]
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C5: Ontology GO: Gene Ontology GO:MF: GO Molecular Function
