3IK2:
reference: Tertiary structure and characterization of a glycoside hydrolase family 44 endoglucanase from Clostridium acetobutylicum., Warner CD, Hoy JA, Shilling TC, Linnen MJ, Ginder ND, Ford CF, Honzatko RB, Reilly PJ, Appl Environ Microbiol. 2010 Jan;76(1):338-46. Epub 2009 Nov 13. PMID: 19915043

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