( ( ( ( Nucleus ( ( The ( central core ) ) ( of ( an atom ) ) ) ) , ) ( containing ( ( protons and ) neutrons ) ) ) ; )
(ROOT (S (VP (VB Nucleus) (NP (NP (DT The) (JJ central) (NN core)) (PP (IN of) (NP (DT an) (NN atom)))) (, ,) (S (VP (VBG containing) (NP (NNS protons) (CC and) (NNS neutrons))))) (: ;)))
Nucleus The central core of an atom, containing protons and neutrons;
(ROOT (S (NP (NNS Protons) (CC and) (NNS neutrons)) (VP (VBP are) (VP (VBN located) (PP (IN in) (NP (DT the) (JJ central) (NN nucleus))))) (. .)))