( ( ( ( ( Fundamental particles ) , ) ( called quarks ) ) , ) ( ( are ( ( held ( in association ) ) ( by ( ( the ( nuclear ( strong force ) ) ) ( in ( ( certain ( stable combinations ) ) ( of ( hadrons ( called ( ( baryons , ) ( that ( ( manifest themselves ) ( as ( ( ( the neutrons ) and ) ( ( the protons ) ( of ( the nucleus ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Fundamental) (NNS particles)) (, ,) (VP (VBN called) (NP (NNS quarks))) (, ,)) (VP (VBP are) (VP (VBN held) (PP (IN in) (NP (NN association))) (PP (IN by) (NP (NP (DT the) (JJ nuclear) (JJ strong) (NN force)) (PP (IN in) (NP (NP (JJ certain) (JJ stable) (NNS combinations)) (PP (IN of) (NP (NP (NNS hadrons)) (VP (VBN called) (NP (NP (NNS baryons)) (, ,) (SBAR (WHNP (WDT that)) (S (VP (VBP manifest) (NP (PRP themselves)) (PP (IN as) (NP (NP (DT the) (NNS neutrons)) (CC and) (NP (NP (DT the) (NNS protons)) (PP (IN of) (NP (DT the) (NN nucleus))))))))))))))))))) (. .)))
Fundamental particles, called quarks, are held in association by the nuclear strong force in certain stable combinations of hadrons called baryons, that manifest themselves as the neutrons and the protons of the nucleus.
(ROOT (S (NP (NNS Protons) (CC and) (NNS neutrons)) (VP (VBP are) (VP (VBN made) (PP (IN of) (NP (NP (NNS quarks)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (NP (NP (JJ fundamental) (NNS particles)) (PP (IN of) (NP (NN matter))))))))))) (. .)))