2HAC:
reference: The structure of the zetazeta transmembrane dimer reveals features essential for its assembly with the T cell receptor., Call ME, Schnell JR, Xu C, Lutz RA, Chou JJ, Wucherpfennig KW, Cell. 2006 Oct 20;127(2):355-68. PMID: 17055436

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