1OT2:
reference: The fully conserved Asp residue in conserved sequence region I of the alpha-amylase family is crucial for the catalytic site architecture and activity., Leemhuis H, Rozeboom HJ, Dijkstra BW, Dijkhuizen L, FEBS Lett 2003 Apr 24;541(1-3):47-51. PMID: 12706817

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