FIG. 2.

The peptide P-197 does not block syncytium formation by an unrelated retrovirus. HeLa cells transfected with the HTLV-1 envelope expression construct HTE-1 (HTLV) or the feline immunodeficiency virus proviral clone pFIV-34TF10 (FIV) were cocultured with untransfected target HeLa cells in the presence of the indicated peptides. Syncytium formation is expressed as a percentage relative to the number of syncytia obtained with each viral envelope in the absence of peptide (Control). Data are means and standard deviations from three low-power fields from three independent assays.