1W4P:
reference: Binding of non-natural 3'-nucleotides to ribonuclease A., Jenkins CL, Thiyagarajan N, Sweeney RY, Guy MP, Kelemen BR, Acharya KR, Raines RT, FEBS J. 2005 Feb;272(3):744-55. PMID: 15670155

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