( ( A human ) ( normally ( ( has ( ( 23 pairs ) ( of chromosomes ) ) ) . ) ) )
(ROOT (S (NP (DT A) (NN human)) (ADVP (RB normally)) (VP (VBZ has) (NP (NP (CD 23) (NNS pairs)) (PP (IN of) (NP (NNS chromosomes))))) (. .)))
A human normally has 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))))) (. .)))