( ( ( Protons and ) neutrons ) ( ( ( are each ) ( made ( of ( three quarks ) ) ) ) . ) )
(ROOT (S (NP (NNS Protons) (CC and) (NNS neutrons)) (VP (VBP are) (ADVP (DT each)) (VP (VBN made) (PP (IN of) (NP (CD three) (NNS quarks))))) (. .)))
Protons and neutrons are each made of 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))))) (. .)))