( ( The ( cell wall ) ) ( ( ( is not ) ( a ( freestanding structure ) ) ) ; ) )
(ROOT (S (NP (DT The) (NN cell) (NN wall)) (VP (VBZ is) (RB not) (NP (DT a) (JJ freestanding) (NN structure))) (: ;)))
The cell wall is not a freestanding structure;
(ROOT (S (NP (DT A) (NN cell) (NN wall)) (VP (VBZ is) (RB not) (ADJP (JJ present) (PP (IN in) (NP (NN animal) (NNS cells))))) (. .)))