Who won a Nobel Prize for Chemistry in 1958 for his work on the structure of protein?

Frederick Sanger (13 August 1918 – 19 November 2013) was an English biochemist who twice won the Nobel Prize in Chemistry. He is one of only two people to have done so in the same category (the other is John Bardeen in physics), and the fourth person with two Nobel Prizes. In 1958, he was awarded a Nobel Prize in Chemistry "for his work on the structure of proteins, especially that of insulin". In 1980, Walter Gilbert and Sanger shared half of the chemistry prize "for their contributions concerning the determination of base sequences in nucleic acids".

Sanger stayed in Cambridge and in 1943 joined the group of Charles Chibnall, a protein chemist who had recently taken up the chair in the Department of Biochemistry. Chibnall had already done some work on the amino acid composition of bovine insulin and suggested that Sanger look at the amino groups in the protein. Insulin could be purchased from the pharmacy chain Boots and was one of the very few proteins that were available in a pure form.