Fig. 1

Secondary structure model of HPV L2 epitope (amino acids 17–31). a HPV L2 epitope sequence with the identified disulfide bond, (b) Structural template for the QLYKT sequence (PDB-ID: 3H9C), (c) Structural template for the CKQAGTC sequence (PDB-ID: 1L6P), (d) Structural template for the CPPD sequence (PDB-ID: 1FVU), (e) HPV L2 epitope secondary structure model