The mediator complex is part of the RNA polymerase II holoenzyme. Rox3 is a subunit of the mediator complex.

1: Yeast nuclear extract contains two major forms of RNA polymerase II mediator complexes. Liu Y, Ranish JA, Aebersold R, Hahn S; J Biol Chem. 2001;276:7169-7175. PMID:11383511