1NQ6:
reference: Structure of xylanase Xys1delta from Streptomyces halstedii., Canals A, Vega MC, Gomis-Ruth FX, Diaz M, Santamaria R RI, Coll M, Acta Crystallogr D Biol Crystallogr 2003 Aug;59(Pt 8):1447-53. PMID: 12876348

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