What DNA structure did Linus Pauling propose with Robert Corey?

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In early 1953, Linus Pauling and protein crystallographer Robert Corey proposed a structure for DNA consisting of three strands twisted around each other in a ropelike fashion.1

This model was later superseded by the correct structure of DNA, a double helix, which was published shortly thereafter by James Watson and Francis Crick. Pauling’s efforts to refine his model were limited by his lack of access to the high-quality X-ray diffraction images produced by Rosalind Franklin, which were essential to identifying the actual molecular structure.21