( They ( ( may ( have ( ( fever ( , ( headache ( , ( malaise ( and ( enlarged ( lymph nodes ) ) ) ) ) ) ) ) ( -LRB- ( ( ( organs ( of ( the ( immune system ) ) ) ) ( easily ( felt ( in ( the ( ( neck and ) groin ) ) ) ) ) ) -RRB- ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (MD may) (VP (VB have) (NP (NP (NN fever) (, ,) (NN headache) (, ,) (NN malaise) (CC and) (JJ enlarged) (NN lymph) (NNS nodes)) (PRN (-LRB- -LRB-) (NP (NP (NNS organs)) (PP (IN of) (NP (DT the) (JJ immune) (NN system))) (VP (ADVP (RB easily)) (VBN felt) (PP (IN in) (NP (DT the) (NN neck) (CC and) (NN groin))))) (-RRB- -RRB-))))) (. .)))
They may have fever, headache, malaise and enlarged lymph nodes (organs of the immune system easily felt in the neck and groin).
(ROOT (S (NP (DT Each) (NN lymph) (NN organ)) (VP (VBZ has) (NP (NP (DT a) (JJ different) (NN job)) (PP (IN in) (NP (DT the) (JJ immune) (NN system))))) (. .)))