4AVN:
reference: Loop motions important to product expulsion in the Thermobifida fusca glycoside hydrolase Family 6 cellobiohydrolase from structural and computational studies., Wu M, Bu L, Vuong TV, Wilson DB, Crowley MF, Sandgren M, Stahlberg J, Beckham GT, Hansson H, J Biol Chem. 2013 Sep 30. PMID: 24085303

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