And then it combines with another C three B to form the C three BBC three B complex. And then this is basically a molecule that can go on to activate the C five protein. And remember from our classical pathway discussion, it's the C five that is responsible for essentially building the membrane attack complexes that can go on to the membrane of those infected or pathogenic cells and essentially build that water channel that will lyse that cell and kill off that cell. So once we form this pathway in process A, once we form this complex in process A, it goes on, activates C five C five C five is broken down into C five A and C five B, and it's C five B that basically calls upon C six C seven C eight. They combine to form that membrane attack complex that forms that water channel on that membrane that license that cell. Now, the other pathway is pathway B.