( Lignins ( ( are ( built ( into ( ( the structure ) ( of ( the ( cell wall ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Lignins)) (VP (VBP are) (VP (VBN built) (PP (IN into) (NP (NP (DT the) (NN structure)) (PP (IN of) (NP (DT the) (NN cell) (NN wall))))))) (. .)))
Lignins are built into the structure of the cell wall.
(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))))) (. .)))