1QTN:
reference: The atomic-resolution structure of human caspase-8, a key activator of apoptosis., Watt W, Koeplinger KA, Mildner AM, Heinrikson RL, Tomasselli AG, Watenpaugh KD, Structure Fold Des 1999 Sep 15;7(9):1135-43. PMID: 10508785

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