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  • A pegylated derivative of the cyclic tridecapeptide compstatin and inhibitor of complement component C3 (C3) activation, with potential use as a treatment for various diseases in which excessive complement activation plays a key role, including paroxysmal nocturnal hemoglobinuria (PNH) and age-related macular degeneration (AMD). Upon administration, C3-targeted complement inhibitor APL-2 selectively binds to C3 and blocks the cleavage of C3 into C3a and C3b by C3 convertase. This prevents complement pathway activation, and inhibits complement-mediated inflammation and cell lysis. Pegylation increases compstatin\'s half-life, and increases its efficacy. Excessive complement activation plays a key role in various inflammatory and autoimmune diseases, and leads to tissue destruction. C3 is a crucial and central component of the complement system.
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