2SAK:
reference: Three-dimensional structure of staphylokinase, a plasminogen activator with therapeutic potential., Rabijns A, De Bondt HL, De Ranter C, Nat Struct Biol 1997 May;4(5):357-60. PMID: 9145104

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