( lung ( ( showed ( irregular ( bronchiole-like ( and ( alveolus-like structures ) ) ) ) ) . ) )
(ROOT (S (NP (NN lung)) (VP (VBD showed) (NP (NN irregular) (JJ bronchiole-like) (CC and) (JJ alveolus-like) (NNS structures))) (. .)))
lung showed irregular bronchiole-like and alveolus-like structures.
(ROOT (S (NP (NP (DT The) (NNS lungs)) (PP (IN of) (NP (NNS mammals)))) (VP (VBP are) (ADJP (JJ unique) (PP (IN in) (S (VP (VBG having) (NP (NNS alveoli))))))) (. .)))