( ( These cells ) ( ( ( play ( an ( important role ) ) ) ( ( ( in ( ( the ( host defense ) ) ( against infection ) ) ) and ) ( as ( ( central participants ) ( in ( ( both ( ( immunologic and ) inflammatory ) ) responses ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT These) (NNS cells)) (VP (VBP play) (NP (DT an) (JJ important) (NN role)) (PP (PP (IN in) (NP (NP (DT the) (NN host) (NN defense)) (PP (IN against) (NP (NN infection))))) (CC and) (PP (IN as) (NP (NP (JJ central) (NNS participants)) (PP (IN in) (NP (ADJP (DT both) (JJ immunologic) (CC and) (JJ inflammatory)) (NNS responses))))))) (. .)))
These cells play an important role in the host defense against infection and as central participants in both immunologic and inflammatory responses.
(ROOT (S (NP (JJ Inflammatory) (NN response)) (VP (VBZ is) (NP (NP (DT the) (JJ second) (NN line)) (PP (IN of) (NP (NN defense))))) (. .)))