( ( The ( protein ( buffer system ) ) ) ( ( ( ( ( is ( ( an ( ( ( abundant and ) powerful ) means ) ) ( of ( ( regulating pH ) ( inside cells ) ) ) ) ) , ) and ) ( has ( ( a ( limited role ) ) ( in ( buffering ( the ( blood plasma ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN protein) (NN buffer) (NN system)) (VP (VP (VBZ is) (NP (NP (DT an) (ADJP (JJ abundant) (CC and) (JJ powerful)) (NN means)) (PP (IN of) (S (VP (VBG regulating) (NP (NN pH)) (PP (IN inside) (NP (NNS cells)))))))) (, ,) (CC and) (VP (VBZ has) (NP (NP (DT a) (JJ limited) (NN role)) (PP (IN in) (S (VP (VBG buffering) (NP (DT the) (NN blood) (NN plasma)))))))) (. .)))
The protein buffer system is an abundant and powerful means of regulating pH inside cells, and has a limited role in buffering the blood plasma.
(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)))))))) (. .)))