Factor I (FI) is a crucial inhibitor controlling all complement pathways due to its ability to degrade activated complement proteins C3b and C4b in the presence of cofactors such as factor H, C4b-binding protein, complement receptor 1 or CD46. Complete deficiency of FI, which is synthesized mainly in the liver is rare and leads to complement consumption resulting in recurrent severe infections, glomerulonephritis or autoimmune diseases. Incomplete FI deficiency is in turn associated with atyp...Expand abstract
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Complement factor I in health and disease.
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