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URL: http://scholar.google.com/scholar_lookup?title=Ligation+of+B7-1%2FB7-2+by+human+CD4%28%2B%29+T+cells+triggers+indoleamine+2%2C3-dioxygenase+activity+in+dendritic+cells.&year=2004&author=Munn&journal=J.+Immunol.&volume=172&pages=4100-4110