xenografts containing normal cells formed well-differentiated stratified squamous epithelia 2 to 3 weeks after transplantation , but cell lines immortalized by four hpv types ( hpv16 , hpv18 , hpv31 , and hpv33 ) detected in anogenital cancer exhibited dysplastic morphology and molecular alterations in gene expression characteristic of intraepithelial neoplasia .
C0334044
dysplastic
C0878500
intraepithelial neoplasia