1IXA:
reference: The three-dimensional structure of the first EGF-like module of human factor IX: comparison with EGF and TGF-alpha., Baron M, Norman DG, Harvey TS, Handford PA, Mayhew M, Tse AG, Brownlee GG, Campbell ID, Protein Sci 1992 Jan;1(1):81-90. PMID: 1304885

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