( Quarks ( ( are ( ( subatomic particles ) ( that ( ( make up ) ( ( ( proton and ) neutrons ) ( found ( in ( ( the nuclei ) ( of atoms ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Quarks)) (VP (VBP are) (NP (NP (JJ subatomic) (NNS particles)) (SBAR (WHNP (WDT that)) (S (VP (VBP make) (PRT (RP up)) (NP (NP (NN proton) (CC and) (NNS neutrons)) (VP (VBN found) (PP (IN in) (NP (NP (DT the) (NN nuclei)) (PP (IN of) (NP (NNS atoms)))))))))))) (. .)))
Quarks are subatomic particles that make up proton and neutrons found in the nuclei of atoms.
(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))))))) (. .)))