5WL6:
reference: Evolution of chalcone isomerase from a noncatalytic ancestor., Kaltenbach M, Burke JR, Dindo M, Pabis A, Munsberg FS, Rabin A, Kamerlin SCL, Noel JP, Tawfik DS, Nat Chem Biol. 2018 Apr 23. pii: 10.1038/s41589-018-0042-3. doi:, 10.1038/s41589-018-0042-3. PMID: 29686356

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