Involved in the negative regulation of transcription. Can form homodimers (By similarity). May be a component of a BHC histone deacetylase complex that contains HDAC1, HDAC2, HMG20B/BRAF35, KDM1A, RCOR1/CoREST, PHF21A/BHC80, ZMYM2, ZNF217, ZMYM3, GSE1 and GTF2I. Interacts with FOXP1 AND FOXP2 (By similarity). Low but widespread expression is detected in the developing kidney.