( ( these chemicals ) ( ( ( ( are ( components ( of ( a ( bacterial ( cell wall ) ) ) ) ) ) and ) ( are ( released ( when ( ( the bacterium ) ( ( dies or ) ( is destroyed ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT these) (NNS chemicals)) (VP (VP (VBP are) (NP (NP (NNS components)) (PP (IN of) (NP (DT a) (JJ bacterial) (NN cell) (NN wall))))) (CC and) (VP (VBP are) (VP (VBN released) (SBAR (WHADVP (WRB when)) (S (NP (DT the) (NN bacterium)) (VP (VP (VBZ dies)) (CC or) (VP (VBZ is) (VP (VBN destroyed))))))))) (. .)))
these chemicals are components of a bacterial cell wall and are released when the bacterium dies or is destroyed.
(ROOT (S (NP (DT A) (NN lysozyme)) (VP (VBZ destroys) (NP (NNS bacteria)) (PP (IN by) (S (VP (VBG digesting) (NP (PRP$ their) (NN cell) (NNS walls)))))) (. .)))