( ( ( Watson and ) Crick ) ( ( suggested ( that ( DNA ( ( ( consisted ( of ( ( two chains ) ( of nucleotides ) ) ) ) and ) ( arranged ( in ( ( the form ) ( of ( ( ( a ( double helix ) ) , ) ( ( ( each strand ) ( of which ) ) ( was ( ( a model ) ( for ( the other ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Watson) (CC and) (NNP Crick)) (VP (VBD suggested) (SBAR (IN that) (S (NP (NNP DNA)) (VP (VP (VBD consisted) (PP (IN of) (NP (NP (CD two) (NNS chains)) (PP (IN of) (NP (NNS nucleotides)))))) (CC and) (VP (VBD arranged) (PP (IN in) (NP (NP (DT the) (NN form)) (PP (IN of) (NP (NP (DT a) (JJ double) (NN helix)) (, ,) (SBAR (WHNP (NP (DT each) (JJ strand)) (WHPP (IN of) (WHNP (WDT which)))) (S (VP (VBD was) (NP (NP (DT a) (NN model)) (PP (IN for) (NP (DT the) (JJ other)))))))))))))))) (. .)))
Watson and Crick suggested that DNA consisted of two chains of nucleotides and arranged in the form of a double helix, each strand of which was a model for the other.
(ROOT (S (NP (NNP Dna)) (VP (VBZ consists) (PP (IN of) (NP (NP (CD two) (JJ long) (NNS chains)) (PP (IN of) (NP (NNS nucleotides)))))) (. .)))