How did Rosalind Franklin miss the helix in her iconic DNA image? She didn't

Rosalind Franklin's iconic X-ray diffraction image of DNA, known as 'Photograph 51', has been widely believed to have revealed the double helix structure of DNA. However, this is not the case. Franklin's image did show a helix, but it was a B-form helix, not the A-form helix that Watson and Crick used to build their famous model. Franklin's image was taken with a different technique, using a different crystal of DNA, and showed a different form of the molecule. The article discusses how Franklin's data was used by Watson and Crick to build their model, and how her contributions to the discovery of the double helix structure have often been overlooked.