1IGM:
reference: Three-dimensional structure of an Fv from a human IgM immunoglobulin., Fan ZC, Shan L, Guddat LW, He XM, Gray WR, Raison RL, Edmundson AB, J Mol Biol 1992 Nov 5;228(1):188-207. PMID: 1447781

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