1MCO:
reference: Three-dimensional structure of a human immunoglobulin with a hinge deletion., Guddat LW, Herron JN, Edmundson AB, Proc Natl Acad Sci U S A. 1993 May 1;90(9):4271-5. PMID: 8483943

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