Maximum Likelihood Molecular Phylogenetic analysis using five nucleotide sequences of HPV-16 E7 gene. Study sequences are labeled in KP GenBank accession numbers. Others are reference GenBank sequences, including: NC_001526 (HPV-16 Ref), HQ644236, AF536179, HQ644238, AF472508, HQ644237, AF472509, HQ644247, AF402678 and HQ644292. Phylogenetic trees were constructed by the Maximum Likelihood method and the Kimura 3-Parameter model by MEGA package. Bootstrap proportions were calculated with 1000 replicates.