( Humans ( ( have ( ( 23 pair ) ( of chromosomes ) ) ) . ) )
(ROOT (S (NP (NNS Humans)) (VP (VBP have) (NP (NP (CD 23) (NN pair)) (PP (IN of) (NP (NNS chromosomes))))) (. .)))
Humans have 23 pair of chromosomes.
(ROOT (S (NP (DT A) (JJ normal) (JJ human) (NN liver) (NN cell)) (VP (VBZ has) (NP (NP (CD 23) (NNS pairs)) (PP (IN of) (NP (NNS chromosomes))))) (. .)))