( ( A ( normal ( human cell ) ) ) ( ( contains ( ( ( ( 46 chromosomes ) , ) or ) ( ( two sets ) ( of ( 23 chromosomes ) ) ) ) ) ; ) )
(ROOT (S (NP (DT A) (JJ normal) (JJ human) (NN cell)) (VP (VBZ contains) (NP (NP (CD 46) (NNS chromosomes)) (, ,) (CC or) (NP (NP (CD two) (NNS sets)) (PP (IN of) (NP (CD 23) (NNS chromosomes)))))) (: ;)))
A normal human cell contains 46 chromosomes, or two sets of 23 chromosomes;
(ROOT (S (SBAR (IN If) (S (NP (NP (DT the) (NN dna)) (PP (IN from) (NP (NP (DT all) (CD 46) (NNS chromosomes)) (PP (IN in) (NP (DT a) (JJ human) (NN cell) (NN nucleus)))))) (VP (VBD was) (VP (VBN laid) (PRT (RP out)) (NP (NN end)) (S (VP (TO to) (VP (VB end)))))))) (, ,) (NP (PRP it)) (VP (MD would) (VP (VB measure) (ADVP (NP (QP (RB approximately) (CD two)) (NNS meters)) (RB long)))) (. .)))
If the dna from all 46 chromosomes in a human cell nucleus was laid out end to end, it would measure approximately two meters long.