We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleThe limb bud Shh-Fgf feedback loop is terminated by expansion of former ZPA cells.AuthorsScherz PJ; Harfe BD; McMahon AP; Tabin CJPublicationScience (New York, N.Y.), 2004, Vol 305, Issue 5682, p396ISSN1095-9203Publication typearticleDOI10.1126/science.1096966