( Nucleus ( ( ( The nucleus ) ( of ( an atom ) ) ) ( ( is ( comprised ( of ( ( protons and ) neutrons ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Nucleus)) (NP (NP (DT The) (NN nucleus)) (PP (IN of) (NP (DT an) (NN atom)))) (VP (VBZ is) (VP (VBN comprised) (PP (IN of) (NP (NNS protons) (CC and) (NNS neutrons))))) (. .)))
Nucleus The nucleus of an atom is comprised of protons and neutrons.
(ROOT (S (NP (NP (DT The) (NN atom)) (PP (IN in) (NP (DT a) (NN neutron)))) (VP (VBZ is) (VP (VBN found) (PP (IN in) (NP (DT the) (DT the) (NN nucleus))))) (. .)))