( ( ( 3 -RRB- ) ( ( Structural components ) ( of ( the ( cell wall ) ) ) ) ) ; )
(ROOT (NP (NP (LST (LS 3) (-RRB- -RRB-)) (NP (JJ Structural) (NNS components)) (PP (IN of) (NP (DT the) (NN cell) (NN wall)))) (: ;)))
3) Structural components 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))))) (. .)))