| 1WQS: reference: A norovirus protease structure provides insights into active and substrate binding site integrity., Nakamura K, Someya Y, Kumasaka T, Ueno G, Yamamoto M, Sato T, Takeda N, Miyamura T, Tanaka N, J Virol. 2005 Nov;79(21):13685-93. PMID: 16227288 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).