( ( ( ( The ( Complement System ) ) ( a set ) ) ( of 20 ) ) ( ( ( ( normally ( inactive ( proteins ( in ( blood plasma ) ) ) ) ) and ) ( ( on ( plasma membranes ) ) ( when ( activated ( they ( complement ( certain ( immune ( , ( allergic ( and ( inflammatory reactions ) ) ) ) ) ) ) ) ) ) ) ) V. ) )
(ROOT (SINV (FRAG (NP (NP (NP (DT The) (NNP Complement) (NNP System)) (NP (DT a) (NN set))) (PP (IN of) (NP (CD 20))))) (VP (VP (ADVP (RB normally)) (VBP inactive) (NP (NP (NNS proteins)) (PP (IN in) (NP (NN blood) (NN plasma))))) (CC and) (VP (PP (IN on) (NP (NN plasma) (NNS membranes))) (SBAR (WHADVP (WRB when)) (S (VP (VBN activated) (S (NP (PRP they)) (VP (VB complement) (NP (JJ certain) (JJ immune) (, ,) (JJ allergic) (CC and) (JJ inflammatory) (NNS reactions))))))))) (NP (NNP V.))))
The Complement System a set of 20 normally inactive proteins in blood plasma and on plasma membranes when activated they complement certain immune, allergic and inflammatory reactions V.
(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)))))))) (. .)))