We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleAlternatively and constitutively spliced exons are subject to different evolutionary forces.AuthorsChen FC; Wang SS; Chen CJ; Li WH; Chuang TJPublicationMolecular biology and evolution, 2006, Vol 23, Issue 3, p675ISSN0737-4038Publication typearticleDOI10.1093/molbev/msj081