3N6R:
reference: Crystal structure of the alpha(6)beta(6) holoenzyme of propionyl-coenzyme A carboxylase., Huang CS, Sadre-Bazzaz K, Shen Y, Deng B, Zhou ZH, Tong L, Nature. 2010 Aug 19;466(7309):1001-5. PMID: 20725044

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