Which of the following is capable of initiating the alternative pathway of complement fixation by directly binding to the surfaces of certain cell types?

Which of the following is capable of initiating the alternative pathway of complement fixation by directly binding to the surfaces of certain cell types?

Which of the following is capable of initiating the alternative pathway of complement fixation by directly binding to the surfaces of certain cell types?











A. DAF (CD55)
B. Properdin
C. Factor H
D. Factor I
E. MCP (CD46)













Answer: B