1AQH:
reference: Crystal structures of the psychrophilic alpha-amylase from Alteromonas haloplanctis in its native form and complexed with an inhibitor., Aghajari N, Feller G, Gerday C, Haser R, Protein Sci 1998 Mar;7(3):564-72. PMID: 9541387

This OCA Structure page
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