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Background
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Factor I is a serine protease with a high degree of specificity for C3b and C4b. It requires protein cofactors for cleavage of these complement protein breakdown products: Factor H, CR1 and MCP are required for C3b cleavage and C4bp or CR1 for C4b cleavage.Synonyms: AHUS3, C3B/C4B inactivator, C3BINA, C3b-INA, CFI, IF, KAF
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