PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 25980911-2 2015 First, O-GlcNAc-modified peptides were enzymatically labeled with an azide-containing GalNAc analog. N-acetylgalactosaminuronic acid 86-92 O-linked N-acetylglucosamine (GlcNAc) transferase Homo sapiens 7-15