( Complement ( ( is ( ( a collection ) ( of ( ( protein substances ) ( in ( ( the ( blood plasma ) ) ( involved ( in ( ( the removal ) ( of ( foreign substances ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Complement)) (VP (VBZ is) (NP (NP (DT a) (NN collection)) (PP (IN of) (NP (NP (NN protein) (NNS substances)) (PP (IN in) (NP (NP (DT the) (NN blood) (NN plasma)) (VP (VBN involved) (PP (IN in) (NP (NP (DT the) (NN removal)) (PP (IN of) (NP (JJ foreign) (NNS substances)))))))))))) (. .)))
Complement is a collection of protein substances in the blood plasma involved in the removal of foreign substances.
(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)))))))) (. .)))