The Rho termination factor disengages newly transcribed RNA from its DNA template at certain, specific transcripts. It it thought that two copies of Rho bind to RNA and that Rho functions as a hexamer of protomers [1].

1: The structural basis for terminator recognition by the Rho transcription termination factor. Bogden CE, Fass D, Bergman N, Nichols MD, Berger JM; Mol Cell 1999;3:487-493. PMID:10230401