1JTM:
reference: Crystal structures of a T4-lysozyme duplication-extension mutant demonstrate that the highly conserved beta-sheet region has low intrinsic folding propensity., Sagermann M, Matthews BW, J Mol Biol 2002 Mar 1;316(4):931-40. PMID: 11884133

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