What is the background for this study? What are the main findings? Dr. Hajishengallis: The current study is the result of eight years of collaboration with my colleague at Penn Medicine, Dr. John D. Lambris. In our earlier mechanistic studies, we have shown that complement, a system of innate immunity and inflammation, is critically involved in the pathogenesis of periodontitis, an oral inflammatory disease that leads to the destruction of the tissues (gums and bone) that support the teeth. C3 is the central component of the complement system, where all activation pathways converge.”

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