Production of O-GlcNAc Modified Recombinant Tau in E. coli and Detection of Ser400 O-GlcNAc Tau In Vivo. Alzforum, 23 Dec 2016 . Production of O-GlcNAc Modified Recombinant Tau in E. coli and Detection of Ser400 O-GlcNAc Tau In Vivo.