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Crystal structure of Acid-1Y*. (A) Ribbon diagram of Acid-1Y* octamer with parallel helices represented by similar shading. The rmsd is 20 Å between the previously solved Zwit-1F and the current Acid-1Y structures. (B) Space-filling model of leucine side-chain packing in the Acid-1Y* core. Ribbon diagram of (C) parallel and (D) antiparallel helices illustrating side-chain interactions.
