( ( Human beings ) ( ( ( have ( 23 ( pairs chromosomes ) ) ) ( in ( each cell ) ) ) . ) )
(ROOT (S (NP (NNP Human) (NNS beings)) (VP (VBP have) (NP (CD 23) (NNS pairs) (NNS chromosomes)) (PP (IN in) (NP (DT each) (NN cell)))) (. .)))
Human beings have 23 pairs chromosomes in each cell.
(ROOT (S (NP (NNS Humans)) (VP (VBP have) (NP (NP (CD 23) (JJ pairs) (NNS pairs)) (PP (IN of) (NP (NNS chromosomes))))) (. .)))