3WSU:
reference: The loop structure of Actinomycete glycoside hydrolase family 5 mannanases governs substrate recognition., Kumagai Y, Yamashita K, Tagami T, Uraji M, Wan K, Okuyama M, Yao M, Kimura A, Hatanaka T, FEBS J. 2015 Aug 9. doi: 10.1111/febs.13401. PMID: 26257335

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