1NDM:
reference: X-ray snapshots of the maturation of an antibody response to a protein antigen., Li Y, Li H, Yang F, Smith-Gill SJ, Mariuzza RA, Nat Struct Biol 2003 Jun;10(6):482-8. PMID: 12740607

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