( ( The ( lipid membrane ) ) ( ( plays ( this role ) ) . ) )
(ROOT (S (NP (DT The) (NN lipid) (NN membrane)) (VP (VBZ plays) (NP (DT this) (NN role))) (. .)))
The lipid membrane plays this role.
(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))))) (. .)))