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Figure 4
Notebook entries show that Rosalind Franklin (a) recognized that the B form of DNA was likely to have a two-chained helix; (b) was aware of the Chargaff ratios; (c) knew that most, if not all, of the nitrogenous bases in DNA were in the keto configuration (my circles indicate the hydrogen positions that distinguish the keto from the enol form); and (d) determined that the backbone chains of A-form DNA are antiparallel. (Courtesy of Anne Sayre and Jenifer Franklin Glynn.
© 2003 American Institute of Physics
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