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URL: http://scholar.google.com/scholar_lookup?title=Lymphopenia+in+inter%C2%ADleukin+%28IL%29-7+gene-deleted+mice+identifies+IL-7+as+a+nonredundant+cytokine.&year=1995&author=von+Freeden-Jeffry&journal=J.+Exp.+Med.&volume=181&pages=1519-1526&doi=10.1084%2Fjem.181.4.1519&pmid=7699333