( ( ( Primary composition ) ( of ( the ( cell membrane ) ) ) ) ( ( is ( phospholipids ( in ( 2 layers ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Primary) (NN composition)) (PP (IN of) (NP (DT the) (NN cell) (NN membrane)))) (VP (VBZ is) (NP (NP (NNS phospholipids)) (PP (IN in) (NP (CD 2) (NNS layers))))) (. .)))
Primary composition of the cell membrane is phospholipids in 2 layers.
(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))))) (. .)))