Identification of BCOR-RARA self-association. (A) Schematic representation of deletion mutants. The filled box is BCOR, and the open box is RARA. AR, ankyrin repeat domain; aa, amino acid. (B) Coimmunoprecipitation in 293T cells between Myc- and FLAG-tagged proteins. (C) Coimmunoprecipitation in 293T cells between Mt-BCL6 and Ft-BCOR-RARA. IP, immunoprecipitation; IB, immunoblotting. *Nonspecific band.