3NFQ:
reference: The Transcription Factor Spn1 Regulates Gene Expression via a Highly Conserved Novel Structural Motif., Pujari V, Radebaugh CA, Chodaparambil JV, Muthurajan UM, Almeida AR, Fischbeck JA, Luger K, Stargell LA, J Mol Biol. 2010 Sep 25. PMID: 20875428

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