We have previously demonstrated that human papillomavirus type 1 (HPV 1) and 16 (HPV 16) E4 proteins form cytoplasmic filamentous networks which specifically colocalize with cytokeratin intermediate-filament (IF) networks when expressed in simian virus 40-transformed keratinocytes. The HPV 16 (but not the HPV 1) E4 protein induced the collapse of the cytokeratin networks.
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