C3 -> C3b
C3b + Factor_B -> C3bB_closed
C3bB_closed -> C3b + Factor_B
C3bB_closed -> C3bB_open
C3bB_open -> C3bB_closed
C3bB_open -> C3bBb
C3bBb -> Bb + C3b
0 -> C3
C3 -> 0
0 -> Factor_B
Factor_B -> 0