1C7S:
reference: Structures of chitobiase mutants complexed with the substrate Di-N-acetyl-d-glucosamine: the catalytic role of the conserved acidic pair, aspartate 539 and glutamate 540., Prag G, Papanikolau Y, Tavlas G, Vorgias CE, Petratos K, Oppenheim AB, J Mol Biol 2000 Jul 14;300(3):611-7. PMID: 10884356

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