4PFH:
reference: Directed Divergent Evolution of a Thermostable D-Tagatose Epimerase towards Improved Activity for Two Hexose Substrates., Bosshart A, Hee CS, Bechtold M, Schirmer T, Panke S, Chembiochem. 2015 Feb 5. doi: 10.1002/cbic.201402620. PMID: 25655925

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