DNA structure

A synthetic DNA molecule
Synthetic DNA molecule

James Watson and Francis Crick worked out the structure of DNA in 1953.

By using data from other scientists (Rosalind Franklin and Maurice Wilkins) they were able to build a model of DNA. The X-ray crystallography data they used showed that DNA consists of two strands coiled into a double helix.

An x-ray diffraction photograph of DNA
The famous X-ray diffraction photograph of DNA taken by Rosalind Franklin, known as photograph 51.