3VHN:
reference: Enhanced activity of Thermotoga maritima cellulase 12A by mutating a unique surface loop., Cheng YS, Ko TP, Huang JW, Wu TH, Lin CY, Luo W, Li Q, Ma Y, Huang CH, Wang AH, Liu JR, Guo RT, Appl Microbiol Biotechnol. 2011 Dec 15. PMID: 22170108

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