1SAN:
reference: The des(1-6)antennapedia homeodomain: comparison of the NMR solution structure and the DNA-binding affinity with the intact Antennapedia homeodomain., Qian YQ, Resendez-Perez D, Gehring WJ, Wuthrich K, Proc Natl Acad Sci U S A 1994 Apr 26;91(9):4091-5. PMID: 7909611

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