?url_ver=Z39.88-2004&rft_id=10.1186%2F1471-2172-7-9&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Graca%2C+L.&rft.aulast=Graca&rft.aufirst=L.&rft.issn=1471-2172&rft.title=BMC+Immunology&rft.date=2006&rft.volume=7&rft.atitle=Co-receptor+and+co-stimulation+blockade+for+mixed+chimerism+and+tolerance+without+myelosuppressive+conditioning&rft.genre=article