( View3 ( ( ( looks down ) ( ( the axis ) ( of ( the ( DNA ( double helix ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP View3)) (VP (VBZ looks) (PRT (RP down)) (NP (NP (DT the) (NNS axis)) (PP (IN of) (NP (DT the) (NNP DNA) (JJ double) (NN helix))))) (. .)))
View3 looks down the axis of the DNA double helix.
(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)))))) (. .)))