( help ( to ( ( form ( ion channels ) ) ( in ( the ( cell membrane ) ) ) ) ) )
(ROOT (S (VP (VB help) (S (VP (TO to) (VP (VB form) (NP (NN ion) (NNS channels)) (PP (IN in) (NP (DT the) (NN cell) (NN membrane)))))))))
help to form ion channels in the cell membrane
(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)))))) (. .)))