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Pattern recognition proteins. The trident of pattern recognition proteins is composed by: (Top) surfactant proteins D and A (SP-D and -A), mannose-binding lectin (MBL) and complement component 1q (C1q); (Middle) native C-reactive protein (nCRP), non-native CRP (nnCRP) and monomeric CRP (mCRP); and (Bottom) natural (innate) immunoglobulin M (IgM) and immune (adaptive) IgM.
