3BH4:
reference: Structure of Bacillus amyloliquefaciens alpha-amylase at high resolution: implications for thermal stability., Alikhajeh J, Khajeh K, Ranjbar B, Naderi-Manesh H, Lin YH, Liu E, Guan HH, Hsieh YC, Chuankhayan P, Huang YC, Jeyaraman J, Liu MY, Chen CJ, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2010 Feb 1;66(Pt, 2):121-9. Epub 2010 Jan 26. PMID: 20124706

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