( ( Cytochrome C ) ( ( is ( ( an enzyme ) ( that ( plays ( ( an ( important role ) ) ( in ( ( the metabolism ) ( of ( aerobic cells ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Cytochrome) (NNP C)) (VP (VBZ is) (NP (NP (DT an) (NN enzyme)) (SBAR (WHNP (WDT that)) (S (VP (VBZ plays) (NP (NP (DT an) (JJ important) (NN role)) (PP (IN in) (NP (NP (DT the) (NN metabolism)) (PP (IN of) (NP (JJ aerobic) (NNS cells))))))))))) (. .)))
Cytochrome C is an enzyme that plays an important role in the metabolism of aerobic cells.
(ROOT (S (NP (NP (DT The) (NN structure)) (PP (IN of) (NP (NN mitochondrion)))) (VP (VBZ plays) (NP (NP (DT an) (JJ important) (NN role)) (PP (IN in) (NP (JJ aerobic) (NN respiration))))) (. .)))