1Y4C:
reference: De novo design of an IL-4 antagonist and its structure at 1.9 A., Laporte SL, Forsyth CM, Cunningham BC, Miercke LJ, Akhavan D, Stroud RM, Proc Natl Acad Sci U S A 2005 Feb 8;102(6):1889-94. Epub 2005 Jan 31. PMID: 15684085

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