( ( ( Protons and ) neutrons ) ( alike ( ( are ( ( called nucleons ) ( because ( they ( are ( part ( of ( the nucleus ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NNS Protons) (CC and) (NNS neutrons)) (ADVP (RB alike)) (VP (VBP are) (VP (VBN called) (NP (NNS nucleons)) (SBAR (IN because) (S (NP (PRP they)) (VP (VBP are) (NP (NP (NN part)) (PP (IN of) (NP (DT the) (NN nucleus))))))))) (. .)))
Protons and neutrons alike are called nucleons because they are part of the nucleus.
(ROOT (S (NP (NP (DT The) (JJ subatomic) (NNS particles)) (PP (IN of) (NP (DT the) (NN nucleus)))) (VP (VBP are) (VP (VBN called) (NP (NNS nucleons)))) (. .)))