1RSM:
reference: The 2-A resolution structure of a thermostable ribonuclease A chemically cross-linked between lysine residues 7 and 41., Weber PC, Sheriff S, Ohlendorf DH, Finzel BC, Salemme FR, Proc Natl Acad Sci U S A 1985 Dec;82(24):8473-7. PMID: 3936036

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