N-linked glycosylation frequency observed in the env gp120 C2-V5 region across plasma and cellular viral sequences. Frequency of HIV-1 N-linked glycosylation sites in plasma and diverse blood leukocyte populations. The X-axis represents the potential N-linked glycosylation sites identified in our study. The Y-axis shows the percentage frequency of the sequences for each compartment found with NLG at the relevant position. Below the bar chart is the env gp120 sequence of our reference HIV-1 HXB2 strain. Lines from the X-axis to the reference sequence illustrate where the observed NLG in our data would be on HXB2. NLG sites observed were matched with those reported by Wei et al  using the GenBank sequence U21135. The numbers below each red oval indicates where you might associate our NLG site with those from the study by Wei et al  in the GenBank sequence U21135. Positions with no visual correlation are indicated with a dash '-'.
Ho et al. Virology Journal 2008 5:14 doi:10.1186/1743-422X-5-14