Factor B is a protein that plays a crucial role in the alternative pathway of the complement system, which is an essential part of the innate immune response. It helps to activate the complement cascade when pathogens are detected, enhancing the body's ability to fight infections. Factor B works by binding to C3b, allowing for its cleavage by Factor D, which generates the C3 convertase enzyme that amplifies the immune response against invading pathogens.
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