TAF4BTranscription initiation factor TFIID subunit 4B is a protein that in humans is encoded by the TAF4B gene.FunctionTATA-binding protein associated factors participate, with TATA binding protein, in the formation of the TFIID protein complex, which is involved in the initiation of gene transcription by RNA polymerase II.InteractionsTAF4B has been shown to interact with RELA.