The difference in the three pathways is the way the C3 convertase is formed
a. in the classical pathway, the C3 convertase is C1C2; in the alternative pathway, it is C3wBb; and in the MBL pathway, the C3 convertase is C2aC4b
b. in the classical pathway, the C3 convertase is C2aC4b' in the alternative pathway, it is C3wBb; and in the MBL pathway, the C3 convertase is C2aC4b
c. in the classical pathway, the C3 convertase is C1C2; in the alternative pathway, it is C3wBb; and in the MBL pathway, the C3 convertase is MBL-MASP-2
d. in the classical pathway, the C3 convertase is C2aC4b; in the alternative pathway, it is PDBb; and in the MBL pathway, the C3 convertase is C2aC4b
B
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