to analyse tissue-specific differences in replication and transcription , and to identify viral gene products important in the benign transformation of epithelial cells , we have modified procedures utilizing guanidinium isothiocyanate and density gradient centrifugation to facilitate the extraction of relatively undegraded dna and rna from 21 biopsy specimens of respiratory tract papillomata .
C0040649
transcription
C0035668
rna