( ( Forage ( ( ( cell ( wall structure ) ) and ) digestibility ) ) . )
(ROOT (S (VP (VB Forage) (NP (NP (NN cell) (NN wall) (NN structure)) (CC and) (NP (NN digestibility)))) (. .)))
Forage cell wall structure and digestibility.
(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))))) (. .)))