Introduction - This is an IgG immunoglobulin (please be patient; it may take a moment for the structure to load). (Based on 2ig2.pdb, M. Marquart & R.Huber Biol.Chem.HoppeSeyler 370 263 (1989)).
The protein is GREEN. Note that two oligosaccharide chains (spacefill) help hold the heavy chains together.