Illustrations

PHOTOGRAPHS

Crick and Watson, along the backs

Francis in the Cavendish

Maurice Wilkins World Wide Photos

The microbial genetics meeting, Copenhagen, March

Linus Pauling Information Office, California Institute of Technology

Sir Lawrence Bragg

Rosalind Franklin

X-ray diffraction photograph of DNA, A form

Elizabeth Watson

In Paris, spring 1952

The meeting at Royaumont, July 1952

In the Italim Alps, August 1952

Early ideas on the DNA-RNA-protein relation

X-ray diffraction photograph of DNA, B form

Original model of the double helix

Watson and Crick in front of the model Photograph A. C. Barrington Brown

Morning coffee in the Cavendish photograph A. C. Barrington Brown

Letter to Max Delbrück

In Stockholm, December 1962 Svenskt Pressfoto, Stockholm

DIAGRAMS

Short section of DNA, 1951

Chemical structures of the DNA bases, 1951

Covalent bonds of the sugar-phosphate backbone

Schematic view of a nucleotide

Mg++ ions binding phosphate groups

Schematic view of DNA, like-with-like base pairs

Base pairs for the like-with-like structure

Tautomeric forms of guanine and thymine

Base pairs for the double helix

Schematic illustration of the double helix

DNA replication