1DLE: Factor B Serine Protease Domain
reference: New structural motifs on the chymotrypsin fold and their potential roles in complement factor B., Jing H, Xu Y, Carson M, Moore D, Macon KJ, Volanakis JE, Narayana SV, EMBO J 2000 Jan 17;19(2):164-73. PMID: 10637221

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