Classification of papillomaviruses ScienceDirectAn understanding of the relationship between PV types based on nucleotide sequence comparison began to emerge more than 10 years ago Chan et al, 1992a, Chan et al, 1992b, Chan et al, 1995, Van Ranst et al, 1992a, Van Ranst et al, 1992b Continued research based on these principles has led to the taxonomic groupings, which are shown in this .Types ...