( Phospholipids ( ( are ( ( a ( major component ) ) ( of ( cell membranes ) ) ) ) . ) )
(ROOT (S (NP (NNS Phospholipids)) (VP (VBP are) (NP (NP (DT a) (JJ major) (NN component)) (PP (IN of) (NP (NN cell) (NNS membranes))))) (. .)))
Phospholipids are a major component of cell membranes.
(ROOT (S (NP (NNS Phospholipids)) (VP (VBP are) (NP (NP (DT the) (JJ main) (NN component)) (PP (IN of) (NP (DT the) (NN cell) (NN membrane))))) (. .)))