?:definition
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Catalysis of the transfer of a methyl group from S-adenosyl-L-methionine to the delta-nitrogen atom of peptidyl-arginine residues. The reaction is S-adenosyl-L-methionine + [protein]-L-arginine = S-adenosyl-L-homocysteine + [protein]-N5-methyl-L-arginine. [EC:2.1.1.322, PMID:9873020]
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