( ( The ( ( ( up and ) down ) quarks ) ) ( ( can ( be ( combined ( to ( ( make up ) ( ( other particles ) ( including ( ( ( the neutron ) and ) ( the proton ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (ADJP (ADVP (RB up) (CC and) (RB down)) (JJ quarks))) (VP (MD can) (VP (VB be) (VP (VBN combined) (S (VP (TO to) (VP (VB make) (PRT (RP up)) (NP (NP (JJ other) (NNS particles)) (PP (VBG including) (NP (NP (DT the) (NN neutron)) (CC and) (NP (DT the) (NN proton))))))))))) (. .)))
The up and down quarks can be combined to make up other particles including the neutron and the proton.
(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))))))))))) (. .)))