2EJ1:
reference: Crystal structure of Cel44A, a glycoside hydrolase family 44 endoglucanase from Clostridium thermocellum., Kitago Y, Karita S, Watanabe N, Kamiya M, Aizawa T, Sakka K, Tanaka I, J Biol Chem. 2007 Dec 7;282(49):35703-11. Epub 2007 Sep 28. PMID: 17905739

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