( ( Other researchers ) ( ( discovered ( that ( DNA ( has ( ( ( a ( double ( helix shape ) ) ) , ) ( consisting ( of ( ( two ( polynucleotide chains ) ) ( ( held together ) ( by ( bonds ( between ( complementary bases ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Other) (NNS researchers)) (VP (VBD discovered) (SBAR (IN that) (S (NP (NNP DNA)) (VP (VBZ has) (NP (NP (DT a) (JJ double) (NN helix) (NN shape)) (, ,) (VP (VBG consisting) (PP (IN of) (NP (NP (CD two) (JJ polynucleotide) (NNS chains)) (VP (VBN held) (ADVP (RB together)) (PP (IN by) (NP (NP (NNS bonds)) (PP (IN between) (NP (JJ complementary) (NNS bases)))))))))))))) (. .)))
Other researchers discovered that DNA has a double helix shape, consisting of two polynucleotide chains held together by bonds between complementary bases.
(ROOT (S (NP (DT The) (JJ double) (NN helix) (NN dna) (NN shape)) (VP (VBZ forms) (SBAR (WHADVP (WRB when)) (S (NP (DT the) (CD two) (JJ nucleotide) (NNS chains)) (VP (VB wrap) (PRT (RP around)) (NP (DT the) (JJ same) (NNS axis)))))) (. .)))