Complement factor I, also known as C3b/C4b inactivator, is a protein that in humans is encoded by the CFI gene.
Complement Factor I (fI) is a protein of the complement system, first isolated in 1966 in guinea pig serum, that regulates complement activation by cleaving cell-bound or fluid phase C3b and C4b.
Read more about Complement Factor I: Pathology, Synthesis, Structure
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