1AW4:
reference: Structural basis of DNA folding and recognition in an AMP-DNA aptamer complex: distinct architectures but common recognition motifs for DNA and RNA aptamers complexed to AMP., Lin CH, Patel DJ, Chem Biol 1997 Nov;4(11):817-32. PMID: 9384529

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