3AOK:
reference: Crystal structure of the sweet-tasting protein thaumatin II at 1.27A., Masuda T, Ohta K, Tani F, Mikami B, Kitabatake N, Biochem Biophys Res Commun. 2011 Jul 8;410(3):457-60. Epub 2011 Jun 6. PMID: 21672520

This OCA Structure page
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