the entire dna genomes of five different human papillomaviruses ( hpvs ) were cloned into the bamhi site of pbr322 ( hpv-1a , hpv-3 , hpv-4 , and hpv-9 ) or the ecori site of pbr325 ( hpv-2 ) , using as starting materials virus preparations isolated from papillomas of individual patients .
C0021344
hpv
C0042776
virus