This deceptively simple image revolutionised molecular biology. It also represents one of the most notorious controversies in science. ‘Photo 51’ was taken by Rosalind Franklin, who was born on this day in 1920. It is an x-ray crystallography image of DNA, created by bombarding a tiny DNA sample with x-rays for more than 60 hours. To most of us, this striped cross might not mean much, but to a few scientists in 1953 it held the secret to the structure of DNA. The controversy surrounds the instant Maurice Wilkins, who worked in Franklin’s lab, showed the photo to Francis Crick, a molecular biologist at Cambridge University, without Franklin’s knowledge. Crick published a paper with his colleague James Watson describing DNA’s double-helix structure. Wilkins, Crick and Watson shared the Nobel Prize in 1962. Franklin, whose peers never accepted her, died of cancer four years earlier, and couldn’t receive the prize posthumously.
Written by Nick Kennedy
BPoD stands for Biomedical Picture of the Day. Managed by the MRC London Institute of Medical Sciences the website aims to engage everyone, young and old, in the wonders of biomedicine. Images are kindly provided for inclusion on this website through the generosity of scientists across the globe.
BPoD is also available in Catalan at www.bpod.cat with translations by the University of Valencia.