1GMM:
reference: The location of the ligand-binding site of carbohydrate-binding modules that have evolved from a common sequence is not conserved., Czjzek M, Bolam DN, Mosbah A, Allouch J, Fontes CM, Ferreira LM, Bornet O, Zamboni V, Darbon H, Smith NL, Black GW, Henrissat B, Gilbert HJ, J Biol Chem 2001 Dec 21;276(51):48580-7. PMID: 11673472

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