The results suggest a helical structure (which must be very closely packed) containing 2, 3 or 4 co‐axial nucleic acid chains per helical unit, and having the phosphate groups near the outside.

Notes from November 1951 about Franklin's electron microscopy imaging of DNA, which led to Watson & Crick's publication of the structure of DNA by sixteen months. As quoted in How Rosalind Franklin Discovered the Helical Structure of DNA: Experiments in Diffraction (in The Physics Teacher 49, 140 (2011); doi: 10.1119/1.3555496), quoting Rosalind Franklin and DNA (2000), page 15.