( ( Compare ( with ( ( ( ( proton , ) neutron ) and ) ( atomic nucleus ) ) ) ) . )
(ROOT (S (VP (VB Compare) (PP (IN with) (NP (NP (NN proton)) (, ,) (NP (NN neutron)) (CC and) (NP (JJ atomic) (NN nucleus))))) (. .)))
Compare with proton , neutron and atomic nucleus .
(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))))) (. .)))