HDAC1 and neoplasm: Immunoprecipitation (IP) assays with whole cell lysates of pcDNA-FLAG-Meq transfected 293T cells and MDV lymphoblastoid tumor cell line show that Meq could efficiently co-precipitate HDAC1 and 2, as well as protein components of the CoREST (CoREST and LSD-1), NuRD (MTA-1), and Sin3 (Sin3A) complexes in 293T cells (Fig. 1B and Supplementary Fig. S2 online) and MDV lymphoblastoid tumor cells (MKT-1) (Fig. 1C and Supplementary Fig. S2 online).