( ( ( Structural Proteins ) ( in ( Cell ( ( Walls and ) Membranes ) ) ) ) . )
(ROOT (NP (NP (JJ Structural) (NNPS Proteins)) (PP (IN in) (NP (NNP Cell) (NNP Walls) (CC and) (NNP Membranes))) (. .)))
Structural Proteins in Cell Walls and Membranes.
(ROOT (S (NP (JJ Prokaryotic) (NNS cells)) (VP (VBP have) (NP (NP (DT a) (NN cell) (NN wall)) (PP (IN outside) (NP (PRP$ their) (NN plasma) (NN membrane))))) (. .)))