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Life reveals its twisted secret Many scientists tried to discover the structure of DNA before Francis Crick and James Watson proposed the double helix model in 1953, which is now the accepted structure. Maurice Wilkins and Rosalind Franklin had been using x-ray diffraction to examine DNA structure for some time, based at King's College, London. In 1951, Franklin suggested DNA chains are in a helical form containing 2,3 or 4 co-axial nucleic acid chains per helical unit and having phosphate groups near the outside. DNA was known to contain a sugar phosphate backbone and the bases adenine, thymine, guanine and cytosine but the angle and radii at which the DNA twisted around the central axis and the arrangement of these molecules was yet found. Watson and Crick, working in the Cavendish laboratory in Cambridge first suggested a structure consisting 3 chains, where the sugar phosphate backbone was in the centre of...

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