( ( ( respiratory rate ) ( of ( ( 28 breaths ) ( per minute ) ) ) ) ; )
(ROOT (NP (NP (JJ respiratory) (NN rate)) (PP (IN of) (NP (NP (CD 28) (NNS breaths)) (PP (IN per) (NP (NN minute))))) (: ;)))
respiratory rate of 28 breaths per minute;
(ROOT (S (NP (NP (DT The) (JJ normal) (NN respiratory) (NN rate)) (PP (IN per) (NP (NP (NN minute)) (PP (IN in) (NP (JJ adult) (NNS humans)))))) (VP (VBZ is) (NP (CD 12-18) (NNS breaths))) (. .)))