PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 3366771-11 1988 These results show that an NH2 terminally extended Met-enkephalin Arg6-Gly7-Leu8 variant was N-glycosylated, and hence indicate that the precursor polypeptide proenkephalin A can be glycosylated during translation in the rough endoplasmic reticulum. arg6-gly7-leu8 66-80 proenkephalin Bos taurus 159-174