Factors affecting the activity of muscle phosphorylase b kinase.

In 1992 Krebs and Fischer were awarded the Nobel Prize in Physiology or Medicine "for their discoveries concerning reversible protein phosphorylation as a biological regulatory mechanism." Digital facsimile from PubMedCentral at this link.

Order of authorship in the original publication: Krebs, Graves, Fischer.

(Thanks to Juan Weiss for this reference and its interpretation.)