%0 Journal Article %J Journal of Immunology %D 2005 %T IL-21 sustains CD28 expression on IL-15-activated human naive CD8 + T cells %A Alves, N.L. %A Arosa, F.A. %A van Lier, R.A.W. %B Journal of Immunology %V 175 %P 755 - 762 %8 2005/// %G eng %U http://www.scopus.com/inward/record.url?eid=2-s2.0-23244444668&partnerID=40&md5=78cacb85a67a0256178150e1760e6a1c %N 2