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Neighbor-joining phylogenetic tree of L1 ORFs (nt) of BPVs, including that of the BPV/BR-UEL2 isolate (indicated by shading). The tree is divided into the previously determined genera Deltapapillomavirus (BPV-1 and -2), Epsilonpapillomavirus (BPV-5 and -8), Xipapillomavirus (BPV-3, -4, -6, -9 and -10) and an undesignated PV genus (BPV-7). The numbers at the internal nodes represent the bootstrap support values determined for 1000 replications.
