The sequence of the amino acid residues in performic acid-oxidized ribonuclease.

In 1959 Moore and Stein announced the first determination of the complete amino acid sequence of an enzyme, ribonuclease.

In 1972 Moore and Stein shared half of the Nobel Prize in Chemistry with Christian B. Anfinsen "for their contribution to the understanding of the connection between chemical structure and catalytic activity of the active centre of the ribonuclease molecule."