( ( The subatomic ) ( ( particles ( including ( ( the ( ( protons and ) neutrons ) ) ( that ( are ( found ( in ( ( the nucleus ) ( of ( an atom ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN subatomic)) (VP (VBZ particles) (PP (VBG including) (NP (NP (DT the) (NNS protons) (CC and) (NNS neutrons)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (VP (VBN found) (PP (IN in) (NP (NP (DT the) (NN nucleus)) (PP (IN of) (NP (DT an) (NN atom)))))))))))) (. .)))
The subatomic particles including the protons and neutrons that are found in the nucleus of an atom.
(ROOT (S (NP (NP (DT The) (NN number)) (PP (IN of) (NP (NNS neutrons)))) (VP (MD can) (VP (VB vary) (PP (IN between) (NP (NP (NNS atoms)) (PP (IN of) (NP (DT the) (JJ same) (NN element))))))) (. .)))