( ( PLASMA ( -LRB- ( CELL -RRB- ) ) ) ( ( MEMBRANE 2 ) . ) )
(ROOT (S (NP (NP (NNP PLASMA)) (PRN (-LRB- -LRB-) (NP (NNP CELL)) (-RRB- -RRB-))) (VP (VBP MEMBRANE) (NP (CD 2))) (. .)))
PLASMA (CELL) MEMBRANE 2.
(ROOT (S (NP (DT The) (NN plasma) (NN membrane)) (VP (VBZ controls) (SBAR (WHNP (WP what)) (S (VP (VBZ goes) (PRT (RP in) (CC and) (RP out)) (PP (IN of) (NP (DT a) (NN cell))))))) (. .)))
The plasma membrane controls what goes in and out of a cell.