Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitlePositive selection in the evolution of mammalian interleukin-2 genes.AuthorsZhang J; Nei MPublicationMolecular biology and evolution, 2000, Vol 17, Issue 9, p1413ISSN0737-4038Publication typearticleDOI10.1093/oxfordjournals.molbev.a026425