Fig. 1From: Comparison of the miRNA profiles in HPV-positive and HPV-negative tonsillar tumors and a model system of human keratinocyte clonesPrincipal component analysis plot. Visualization of miRNA expression in model systems. Primary human keratinocytes (pHFK); human keratinocytes immortalized by human telomerase gene (iHFK); HPV immortalized keratinocytes (tHFK)Back to article page