6B7K:
reference: GH43 endo-arabinanase from Bacillus licheniformis: Structure, activity and unexpected synergistic effect on cellulose enzymatic hydrolysis., Farro EGS, Leite AET, Silva IA, Filgueiras JG, de Azevedo ER, Polikarpov I, Nascimento AS, Int J Biol Macromol. 2018 May 23;117:7-16. doi: 10.1016/j.ijbiomac.2018.05.157. PMID: 29800670

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