Loss of the STT3A or STT3B impacts different sequons. (A) Scatter plot of 790 sites shared by the STT3A^−/− and STT3B^−/− datasets. (B) Scatter plot of 808 sites shared by the STT3B^−/− and MAGT1/TUSC3^−/− datasets. (C) Glycosylation of sequons in the C-terminal 150 residues of proteins. Color codes designate protein classes. The number of C-terminal sites (C-terminal 150 residues, Δlog₂ < −1) and proteins from which they are derived are shown above each panel. The gray shaded area designates a region (50–65 residues) of decreasing STT3B dependence (Shrimal et al., 2013b).