“The National Institute of Allergy and Infectious Diseases has awarded the Perelman School of Medicine at the University of Pennsylvania a five­ year, $10 million renewal of a program project to study the oldest part of the human immune system called the complement system, or simply “complement.” Complement is a network of more than 50 proteins in the blood and on cell surfaces and is part of the innate immune system, in contrast to the adaptive system consisting of antibodies which can “learn” and adapt themselves on the fly to different antigens. The complement proteins quietly cruise the blood system, keeping a low profile until triggered into action.”

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