The structure of proteins: Two hydrogen-bonded configurations of the polypeptide chain.

Pauling, his crystallographer R. B. Corey, and African-American physicist and chemist H.R. Branson announced the α-helix, a principal structural feature of proteins. Digital facsimile from the National Academy of Sciences at this link.

In 1954 Pauling was awarded the Nobel Prize in Chemistry "for his research into the nature of the chemical bond and its application to the elucidation of the structure of complex substances." See also Nos. 6914, 3154.1, 13298.