By contrast, in a living cell DNA lives in a very crowded environment, and special proteins attach to DNA to mechanically unwind the double helix and ... Center for 3D Structure and Physics ...

Wilkins later complained to Crick and Watson in a rediscovered letter: "To think that Rosie had all the 3D ... the double-helix structure that helped Crick and Watson build their DNA model.

At the Center for 3D Structure ... was how the shape of DNA allows those genes to work. Each DNA molecule is actually a pair of strands wound together, forming a double helix.