( ( Each ( human cell ) ) ( ( contains ( ( 23 pairs ) ( of chromosomes ) ) ) . ) )
(ROOT (S (NP (DT Each) (JJ human) (NN cell)) (VP (VBZ contains) (NP (NP (CD 23) (NNS pairs)) (PP (IN of) (NP (NNS chromosomes))))) (. .)))
Each human cell contains 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))))) (. .)))