CSB is a component of RNA pol I transcription
Molecular Cell (2002) - Comment
pubmed: 12419226  doi: 10.1016/s1097-2765(02)00678-0  issn: 1097-2765 

John Bradsher, Jerome Auriol, Luca Proietti Proietti De Santis, Sebastian Iben, Jean Luc Vonesch, Ingrid Grummt, Jean Marc Egly