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Human cells contain two types of RNA polymerase III transcription factor(TFIIIB), BRF1 and BRF2. BRF2,also named as BRFU, contains one TFIIB-type zinc finger. It is a general activator of RNA polymerase III transcription. It is a factor exclusively required for RNA polymerase III transcription of genes with promoter elements upstream of the initiation sites. BRF2 is recruited to type 3 promoters such as the human U6 snRNA promoter. It differs from BRF1-TFIIIB in that it contains the TFIIB-related factor BRF2 iinstead of BRF1 and its three components do not form a stable complex. This antibody is a rabbit polyclonal antibody raised against residues near the C terminus of human BRF2. It recognizes a 50-60kd band in WB analysis.