( ( Because ( ( all ( amino acids ) ) ( contain ( ( ( amine and ) carboxylic ) ( acid ( functional groups ) ) ) ) ) ) ( , ( they ( ( share ( amphiprotic properties ) ) . ) ) ) )
(ROOT (S (SBAR (IN Because) (S (NP (DT all) (JJ amino) (NNS acids)) (VP (VBP contain) (NP (ADJP (JJ amine) (CC and) (JJ carboxylic)) (JJ acid) (ADJP (JJ functional)) (NNS groups))))) (, ,) (NP (PRP they)) (VP (VBP share) (NP (JJ amphiprotic) (NNS properties))) (. .)))
Because all amino acids contain amine and carboxylic acid functional groups, they share amphiprotic properties.
(ROOT (S (NP (NNP Amino) (NNS acids)) (VP (VBP contain) (NP (PDT both) (NP (DT a) (JJ carboxylic) (JJ acid) (NN group)) (CC and) (NP (DT a) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (JJ amine) (NN group)))) (. .)))