( ( Human cells ) ( ( contain ( ( 23 pairs ) ( of ( ( chromosomes , ) ( ( a total ) ( of ( 46 chromosomes ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Human) (NNS cells)) (VP (VBP contain) (NP (NP (CD 23) (NNS pairs)) (PP (IN of) (NP (NP (NNS chromosomes)) (, ,) (NP (NP (DT a) (NN total)) (PP (IN of) (NP (CD 46) (NNS chromosomes)))))))) (. .)))
Human cells contain 23 pairs of chromosomes, a total of 46 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))))) (. .)))