PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 22352786-2 2012 Despite their broad interest, fundamental questions about their reaction mechanism remain to be answered, especially for those GTs that transfer the sugar with net retention of the configuration at the anomeric carbon (retaining glycosyltransferases, ret-GTs). Sugars 149-154 ret proto-oncogene Homo sapiens 164-167