( ( ( The structure ) ( of ( the ( cell wall ) ) ) ) ( ( is ( diagnostic ( for identification ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN structure)) (PP (IN of) (NP (DT the) (NN cell) (NN wall)))) (VP (VBZ is) (NP (NP (JJ diagnostic)) (PP (IN for) (NP (NN identification))))) (. .)))
The structure of the cell wall is diagnostic for identification.
(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))))) (. .)))