1AOC:
reference: Crystal structure of a coagulogen, the clotting protein from horseshoe crab: a structural homologue of nerve growth factor., Bergner A, Oganessyan V, Muta T, Iwanaga S, Typke D, Huber R, Bode W, EMBO J 1996 Dec 16;15(24):6789-97. PMID: 9003754

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