( ( Cell biology ) ( ( Membrane ( ( structure and ) composition ) ) . ) )
(ROOT (S (NP (JJ Cell) (NN biology)) (VP (VBP Membrane) (NP (NN structure) (CC and) (NN composition))) (. .)))
Cell biology Membrane structure and composition.
(ROOT (S (NP (JJ Biological) (NNS membranes)) (VP (VP (VBP surround) (NP (NNS cells))) (CC and) (VP (VBP serve) (S (VP (TO to) (VP (VB keep) (NP (NP (DT the) (NNS insides)) (VP (VBN separated) (PP (IN from) (NP (DT the) (NNS outsides)))))))))) (. .)))