( ( Perilipin proteins ) ( ( are ( believed ( to ( ( play ( an ( important role ) ) ) ( in ( lipid hydrolysis ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Perilipin) (NNS proteins)) (VP (VBP are) (VP (VBN believed) (S (VP (TO to) (VP (VB play) (NP (DT an) (JJ important) (NN role)) (PP (IN in) (NP (NN lipid) (NNS hydrolysis)))))))) (. .)))
Perilipin proteins are believed to play an important role in lipid hydrolysis.
(ROOT (S (NP (NNS Lipids)) (VP (VBP play) (NP (NP (JJ several) (JJ important) (NNS roles)) (PP (IN in) (NP (DT the) (JJ human) (NN body))))) (. .)))