Complement component C9 binds to the C5b-8 complex as the final protein of the membrane attack complex. After binding, it undergoes a conformational change and inserts itself into the cell membrane, forming transmembrane channels. Complement component C9 acts in a similar way
to perforin, a pore forming protein found in cytotoxic T cells. Male and female reproductive tissues express and synthesize complement components, binding proteins and receptors, although the implications of this are unclear.
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