Media type: E-Article Title: Expression of Concern: Essential requirement for sphingosine kinase activity in eNOS‐dependent NO release and vasorelaxation Contributor: Roviezzo, Fiorentina; Bucci, Mariarosaria; Delisle, Chantal; Brancaleone, Vincenzo; Lorenzo, Annarita Di; Mayo, Inmaculada Posadas; Fiorucci, Stefano; Fontana, Angelo; Gratton, Jean‐Philippe; Cirino, Giuseppe Published: Wiley, 2006 Published in: The FASEB Journal Extent: 340-342 Language: English DOI: 10.1096/fj.05-4647fje ISSN: 0892-6638; 1530-6860 Keywords: Genetics ; Molecular Biology ; Biochemistry ; Biotechnology Footnote: