Figure 2. Titration of synthetic 12mer peptides.

Serially diluted aliquots containing indicated amounts of synthetic peptide or HBcAg synthetic peptide (G1) were allowed to react with 8H5. The residual antibody available for virus binding with 2 strains of H5N1 was determined by ELISA. 8H5 blocking activity of peptides is expressed as blocking dose, defined as the amount of peptide that reduces 8H5 binding by 50%.