( Humans ( ( have ( ( 23 pairs ) ( of ( chromosomes ( -LRB- ( ( one ( set ( from ( each parent ) ) ) ) -RRB- ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Humans)) (VP (VBP have) (NP (NP (CD 23) (NNS pairs)) (PP (IN of) (NP (NP (NNS chromosomes)) (PRN (-LRB- -LRB-) (NP (NP (CD one)) (VP (VBN set) (PP (IN from) (NP (DT each) (NN parent))))) (-RRB- -RRB-)))))) (. .)))
Humans have 23 pairs of chromosomes (one set from each parent).
(ROOT (S (NP (NNS Humans)) (VP (VBP have) (NP (NP (CD 23) (JJ pairs) (NNS pairs)) (PP (IN of) (NP (NNS chromosomes))))) (. .)))