<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>RNA polymerase II transcription of Class II genes involves the TFIID transcription complex comprised of general factors, including TBP, TFIIA, TFIIB, TFIIE, TFIIF, TFIIG/J, and TFIIH, as well as gene-specific factors that include TAFs, which interact with regulatory protein activation domains to enhance transcription. A second group of cofactors includes PC1, PC2, and PC3, which have a strong positive influence on transcription. A third group of factors suppress transcription. The combined action of general and gene-specific regulators encoded by transcription coactivator genes determines appropriate gene expression. (NCI)</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>