And then the C three B quickly reacts with the factor B to form the C three BB complex. Now, this complex can do one of two things. It can either once again react with another C three and then it forms the C three B and C three A. 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.