3Q1P:
reference: The Nudix Hydrolase CDP-Chase, a CDP-Choline Pyrophosphatase, Is an Asymmetric Dimer with Two Distinct Enzymatic Activities., Duong-Ly KC, Gabelli SB, Xu W, Dunn CA, Schoeffield AJ, Bessman MJ, Amzel LM, J Bacteriol. 2011 Jul;193(13):3175-85. Epub 2011 Apr 29. PMID: 21531795

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