FIG. 1.

PFU recovered when 10¹¹ PFU of phage solutions, obtained after four or five rounds of enrichment against MAb 803-15.6/gp120, were screened against mAb 803-15.6/gp120 or mAb 803-15.6 alone. For each of the three phage-displayed peptide libraries tested, PFU recovered from mAb 803-15.6/gp120 plates was at least 100-fold higher than from MAb 803-15.6 plates, indicating that the phage libraries had been specifically enriched for interaction with gp120.