1QGB:
reference: Solution structure of the N-terminal F1 module pair from human fibronectin., Potts JR, Bright JR, Bolton D, Pickford AR, Campbell ID, Biochemistry 1999 Jun 29;38(26):8304-12. PMID: 10387076

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