General characteristics of eluted host peptides.

<p>Distribution of peptide lengths for all peptides eluted from the four BLCL (A). Peptides ≤8 amino acids are grouped together, as are peptides ≥16 amino acids. Relative distribution of peptide lengths plotted per HLA locus for all peptides eluted from the four BLCL (B). Similar distributions are observed when plotting peptides eluted from individual cell lines. NA: not assigned.