( ( purification ( of ( transmembrane ( and ( membrane-associated proteins ) ) ) ) ) ; )
(ROOT (NP (NP (NN purification)) (PP (IN of) (NP (JJ transmembrane) (CC and) (JJ membrane-associated) (NNS proteins))) (: ;)))
purification of transmembrane and membrane-associated proteins;
(ROOT (S (NP (JJ Transmembrane) (NNS proteins)) (VP (VBP span) (NP (DT the) (JJ entire) (NN plasma) (NN membrane))) (. .)))