1PBA:
reference: The NMR structure of the activation domain isolated from porcine procarboxypeptidase B., Vendrell J, Billeter M, Wider G, Aviles FX, Wuthrich K, EMBO J 1991 Jan;10(1):11-5. PMID: 1989879

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