1A1Q:
reference: The crystal structure of hepatitis C virus NS3 proteinase reveals a trypsin-like fold and a structural zinc binding site., Love RA, Parge HE, Wickersham JA, Hostomsky Z, Habuka N, Moomaw EW, Adachi T, Hostomska Z, Cell 1996 Oct 18;87(2):331-42. PMID: 8861916

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