PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 15494416-6 2005 SDMA was also formed when a GRG tripeptide was methylated by PRMT7, indicating that a GRG motif is by itself sufficient for symmetric dimethylation to occur. tripeptide K-26 32-42 protein arginine methyltransferase 7 Homo sapiens 61-66