title: Signals past, present, and future.
authors.affiliation: Department of Pharmacology, University of California, San Francisco 94143.
authors.forename: H R
authors.initials: HR
authors.lastname: Bourne
mesh_terms: D000818:Animals; D002462:Cell Membrane / Q000378:metabolism; D002467:Cell Nucleus / Q000378:metabolism; D008962:Models, Theoretical; D011506:Proteins / Q000502:physiology*; D015398:Signal Transduction
chemical_list: D011506:Proteins