( ( In ( actual fact ) ) ( , ( ( ( the nucleons ) ( -LRB- ( ( ( protons and ) neutrons ) -RRB- ) ) ) ( ( are ( each ( composed ( of ( ( ( three ( elementary particles ) ) ( ( ( called ` ) quarks ) ' ) ) ( that ( have ( fractional charges ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (JJ actual) (NN fact))) (, ,) (NP (NP (DT the) (NNS nucleons)) (PRN (-LRB- -LRB-) (NP (NP (NNS protons)) (CC and) (NP (NNS neutrons))) (-RRB- -RRB-))) (VP (VBP are) (VP (NP (DT each)) (VBN composed) (PP (IN of) (NP (NP (CD three) (JJ elementary) (NNS particles)) (VP (VBN called) (`` `) (NP (NNS quarks)) ('' ')) (SBAR (WHNP (WDT that)) (S (VP (VBP have) (NP (JJ fractional) (NNS charges))))))))) (. .)))
In actual fact, the nucleons (protons and neutrons) are each composed of three elementary particles called 'quarks' that have fractional charges.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD three) (NNS quarks)) (PP (IN in) (NP (DT each) (NN proton) (CC and) (NN neutron))))) (. .)))