2WPW:
reference: Crystallographic and mass spectrometric analyses of a tandem GNAT protein from the clavulanic acid biosynthesis pathway., Iqbal A, Arunlanantham H, Brown T Jr, Chowdhury R, Clifton IJ, Kershaw NJ, Hewitson KS, McDonough MA, Schofield CJ, Proteins. 2009 Nov 6. PMID: 20014241

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