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We now demonstrate that NAC1 acts as a corepressor for other POZ/BTB proteins. NAC1 is a POZ/BTB motif containing transcriptional repressor protein. In a mammalian two hybrid assay in neuronal (N2A) cells and non-neuronal (HEK 293T) cells, VP16 activation domain tagged NAC1 resulted in significant reversal of transcriptional inhibition with the Gal4-ZID, Gal4-BCL6, Gal4-ZF5, and kelch proteins Gal4-MAYVEN...