Basically, the C three B binds onto the allosteric side and C Five creating a conformational change in its structure. And then the C four B C two B complex goes on and cleaves the C five to form the C five A and C five B Now, C five A doesn't only act as an anaphyla toxin and stimulates the release of histamine. But the C five A also acts in a process known as chemotaxis. And what chemotaxis means is the stimulation of other cells. It calls upon other cells such as, for example, neutrophil. So chemotaxis is the process by which cells use chemicals to basically communicate with one another and call upon one another.