1NGZ:
reference: Structural evidence for substrate strain in antibody catalysis., Yin J, Andryski SE, Beuscher AE 4th, Stevens RC, Schultz PG, Proc Natl Acad Sci U S A 2003 Feb 4;100(3):856-61. Epub 2003 Jan 24. PMID: 12552112

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