4FK9:
reference: Biochemical properties and atomic resolution structure of a proteolytically processed beta-mannanase from cellulolytic Streptomyces sp. SirexAA-E., Takasuka TE, Acheson JF, Bianchetti CM, Prom BM, Bergeman LF, Book AJ, Currie CR, Fox BG, PLoS One. 2014 Apr 7;9(4):e94166. doi: 10.1371/journal.pone.0094166. eCollection , 2014. PMID: 24710170

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).