FIG. 5.

Library-derived targeting peptide sequences show little if any homology to each other or to wild-type FeLV-A and FeLV-C isolates. Targeting peptide sequences of wild-type isolates are shown at the top of the figure. Library-derived peptides are at the bottom of the figure, below the sequence of the peptide region randomized for library screening. Randomized residues are denoted by X and are numbered from 1 to 10. Dots indicate gaps in the sequence. AH927 indicates selection on AH927 cells. D17 indicates selection on D17 cells except for the previously reported EF isolate, which was selected on AH927 cells but specifically infects D17 cells (2).