Good, that's right.

How is this pathway controlled ?

• C5 is a very labile protein and breaks down to C5a and C5b spontaneously

• C5a is a very labile protein and breaks down spontaneously unless it forms a complex with C6

• C5b is a very labile protein and breaks down spontaneously unless it forms a complex with C6

• C5b is a very stable protein and is cleaved by C6