( ( ( blood cells ) and ) ( most ( plasma proteins ) ) )
(ROOT (NP (NP (NN blood) (NNS cells)) (CC and) (NP (JJS most) (NN plasma) (NNS proteins))))
blood cells and most plasma 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)))))))) (. .)))