5E9A:
reference: Cloning, expression and structural stability of a cold-adapted beta-galactosidase from Rahnella sp. R3., Fan Y, Hua X, Zhang Y, Feng Y, Shen Q, Dong J, Zhao W, Zhang W, Jin Z, Yang R, Protein Expr Purif. 2015 Nov;115:158-64. doi: 10.1016/j.pep.2015.07.001. Epub, 2015 Jul 3. PMID: 26145832

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