( Humans ( ( have ( ( 23 pairs ) ( of ( chromosomes ( in ( ( the nucleus ) ( of ( every cell ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Humans)) (VP (VBP have) (NP (NP (CD 23) (NNS pairs)) (PP (IN of) (NP (NP (NNS chromosomes)) (PP (IN in) (NP (NP (DT the) (NN nucleus)) (PP (IN of) (NP (DT every) (NN cell))))))))) (. .)))
Humans have 23 pairs of chromosomes in the nucleus of every cell.
(ROOT (S (NP (NNS Humans)) (VP (VBP have) (NP (NP (CD 23) (JJ pairs) (NNS pairs)) (PP (IN of) (NP (NNS chromosomes))))) (. .)))