( ( ( ( The ( body 's ) ) ( first line ) ) ( of ( defence ( against viruses ) ) ) ) ( ( is ( the ( innate ( immune system ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (DT The) (NN body) (POS 's)) (JJ first) (NN line)) (PP (IN of) (NP (NP (NN defence)) (PP (IN against) (NP (NNS viruses)))))) (VP (VBZ is) (NP (DT the) (JJ innate) (JJ immune) (NN system))) (. .)))
The body's first line of defence against viruses is the innate immune system .
(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)))))))))))) (. .)))