1FDP:
reference: Structural basis of profactor D activation: from a highly flexible zymogen to a novel self-inhibited serine protease, complement factor D., Jing H, Macon KJ, Moore D, DeLucas LJ, Volanakis JE, Narayana SV, EMBO J 1999 Feb 15;18(4):804-14. PMID: 10022823

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