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2-5 The complement system recognizes features of microbial surfaces and marks them for destruction by coating them with C3b.
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2-6 The lectin pathway uses soluble receptors that recognize microbial surfaces to activate the complement cascade.
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2-7 The classical pathway is initiated by activation of the C1 complex and is homologous to the lectin pathway.
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2-8 Complement activation is largely confined to the surface on which it is initiated.