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Circle of Death | © Edmond Alexander The membrane attack complex (MAC) is typically formed on the surface of intruding pathogenic bacterial cells as a result of the activation of the complement system, and it is one of the weapons of the immune system. The ring structure formed by C9 is a pore in the membrane that allows free diffusion of molecules in and out of the cell resulting in cell lysis. For Soliris® for Alexion Pharmaceuticals.
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