( ( Human cells ) ( ( have ( ( 23 pairs ) ( of chromosomes ) ) ) . ) )
(ROOT (S (NP (NNP Human) (NNS cells)) (VP (VBP have) (NP (NP (CD 23) (NNS pairs)) (PP (IN of) (NP (NNS chromosomes))))) (. .)))
Human cells have 23 pairs 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))))) (. .)))