1CPU:
reference: Subsite mapping of the human pancreatic alpha-amylase active site through structural, kinetic, and mutagenesis techniques., Brayer GD, Sidhu G, Maurus R, Rydberg EH, Braun C, Wang Y, Nguyen NT, Overall CM, Withers SG, Biochemistry 2000 Apr 25;39(16):4778-91. PMID: 10769135

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