Analysis of the HIV-1 interstrain variability of each designed peptide sequence. The percentage of interstrain variability (on the ordinate) is reported for each single peptide sequence. Peptides sharing the same based sequence, in order to take into account critical changes in HIV-1 variability are reported as closed bars. Peptides in which sequences are represented only once are depicted as open bars. Inset: the overall variability of the peptides sharing the same base sequence is reported.