( ( A ( lymph node ) ) ( ( ( is actually ) ( part ( of ( the ( immune system ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN lymph) (NN node)) (VP (VBZ is) (ADVP (RB actually)) (NP (NP (NN part)) (PP (IN of) (NP (DT the) (JJ immune) (NN system))))) (. .)))
A lymph node is actually part of the immune system.
(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))))) (. .)))