( ( Each proton ) ( ( consists ( of ( a ( least ( three quarks ) ) ) ) ) . ) )
(ROOT (S (NP (DT Each) (NN proton)) (VP (VBZ consists) (PP (IN of) (NP (DT a) (JJS least) (CD three) (NNS quarks)))) (. .)))
Each proton consists of a least three quarks.
(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))))) (. .)))