NCIt definition : Complement factor B (764 aa, 86 kDa) is encoded by the human CFB gene. This protein
plays a role in C3/C5 convertase activity.;
NCIt note : Binding of complement factor B to complement C3 beta chain (C3b) forms C3 convertase.
Binding of a second C3b molecule to the C3bBb complex (C3bBb3b complex) forms C5 convertase.;