4SGB:
reference: Structure of the complex of Streptomyces griseus proteinase B and polypeptide chymotrypsin inhibitor-1 from Russet Burbank potato tubers at 2.1 A resolution., Greenblatt HM, Ryan CA, James MN, J Mol Biol 1989 Jan 5;205(1):201-28. PMID: 2494344

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uses Jmol, developed by the Jmol Development Team (documentation).