( ( ( ( ( ( Proteins ( The ( three kinds ) ) ) ( of ( proteins ( in ( the ( immune system ) ) ) ) ) ) , ) ( found ( dissolved ( in ( ( the serum ) ( -LRB- ( ( ( the ( liquid portion ) ) ( of ( the blood ) ) ) -RRB- ) ) ) ) ) ) ) , ) ( ( are ( ( ( ( ( immunoglobulins , ) cytokines ) , ) and ) ( complement proteins ) ) ) . ) )
(ROOT (S (NP (NP (NNPS Proteins) (NNP The) (CD three) (NNS kinds)) (PP (IN of) (NP (NP (NNS proteins)) (PP (IN in) (NP (DT the) (JJ immune) (NN system))))) (, ,) (VP (VBN found) (S (VP (VBN dissolved) (PP (IN in) (NP (NP (DT the) (NN serum)) (PRN (-LRB- -LRB-) (NP (NP (DT the) (JJ liquid) (NN portion)) (PP (IN of) (NP (DT the) (NN blood)))) (-RRB- -RRB-))))))) (, ,)) (VP (VBP are) (NP (NP (NNS immunoglobulins)) (, ,) (NP (NNS cytokines)) (, ,) (CC and) (NP (JJ complement) (NNS proteins)))) (. .)))
Proteins The three kinds of proteins in the immune system, found dissolved in the serum (the liquid portion of the blood), are immunoglobulins, cytokines, and complement proteins.
(ROOT (S (NP (DT The) (JJ complement) (NN system)) (VP (VBZ is) (NP (NP (DT a) (NN series)) (PP (IN of) (NP (NP (NNS proteins)) (VP (ADVP (RB constitutively)) (VBN found) (PP (IN in) (NP (DT the) (NN blood) (NN plasma)))))))) (. .)))