( ( ( Ion channels ) ( in ( neuronal ( plasma membranes ) ) ) ) . )
(ROOT (S (VP (VB Ion) (NP (NNS channels)) (PP (IN in) (NP (JJ neuronal) (NN plasma) (NNS membranes)))) (. .)))
Ion channels in neuronal plasma membranes.
(ROOT (NP (NP (NP (NNP Ion) (NNP channels) (NNP facilitate)) (PRN (-LRB- -LRB-) (PRP s) (-RRB- -RRB-))) (NP (NP (DT the) (NN diffusion)) (PP (IN of) (NP (NP (NNS ions)) (PP (IN across) (NP (DT a) (NN membrane)))))) (. .)))