In the article by Madeddu et al, “Cardiovascular Effects of Nociceptin in Unanesthetized Mice” (Hypertension. 1999;33:914–919.), a footnote was omitted. The affiliation should read: From Clinica Medica, Dipartimento di Scienze Biomediche (P.M.) and Farmacologia (P.M., M.B.S., A.F.M., C.E.), University of Sassari; National Laboratory of the National Institute of Biosystems and Biostructures (P.M., C.E.), Osilo; Department of Pharmaceutical Sciences (R.G.) and Department of Experimental and Clinical Medicine (D.R., G.C.), Section of Pharmacology, University of Ferrara, Italy.