( ( 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 (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))))) (. .)))