( ( Each ( normal human ) ) ( ( has ( ( 23 pairs ) ( of chromosomes ) ) ) ; ) )
(ROOT (S (NP (DT Each) (JJ normal) (NN human)) (VP (VBZ has) (NP (NP (CD 23) (NNS pairs)) (PP (IN of) (NP (NNS chromosomes))))) (: ;)))
Each normal human has 23 pairs of chromosomes;
(ROOT (S (NP (NNS Humans)) (VP (VBP have) (NP (NP (CD 23) (JJ pairs) (NNS pairs)) (PP (IN of) (NP (NNS chromosomes))))) (. .)))