( Humans ( ( have ( ( 46 chromosomes ) ( in ( ( ( ( ( each cell ) ( of ( their body ) ) ) , ) or ) ( 23 pairs ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Humans)) (VP (VBP have) (NP (NP (CD 46) (NNS chromosomes)) (PP (IN in) (NP (NP (NP (DT each) (NN cell)) (PP (IN of) (NP (PRP$ their) (NN body)))) (, ,) (CC or) (NP (CD 23) (NNS pairs)))))) (. .)))
Humans have 46 chromosomes in each cell of their body, or 23 pairs.
(ROOT (S (NP (NNS Humans)) (VP (VBP have) (NP (NP (CD 23) (JJ pairs) (NNS pairs)) (PP (IN of) (NP (NNS chromosomes))))) (. .)))