( ( ( The ( body 's ) ) ( immune system ) ) ( ( responds ( with ( a fever ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN body) (POS 's)) (JJ immune) (NN system)) (VP (VBZ responds) (PP (IN with) (NP (DT a) (NN fever)))) (. .)))
The body's immune system responds with a fever.
(ROOT (S (NP (DT The) (JJ innate) (JJ immune) (NN system)) (VP (VBZ serves) (PP (IN as) (NP (NP (DT a) (JJ first) (NN responder)) (PP (TO to) (NP (NP (JJ pathogenic) (NNS threats)) (SBAR (WHNP (WDT that)) (S (VP (VB bypass) (NP (NP (JJ natural) (ADJP (NN physical) (CC and) (NN chemical)) (NNS barriers)) (PP (IN of) (NP (DT the) (NN body)))))))))))) (. .)))