To better evaluate the proliferation/expansion properties of HDAC1-null CD8+ T cells upon in vivo infection, CFSE-labeled Hdac1f/f and Hdac1f/fCd4Cre P14 CD8+ T cells (CD45.2+) were adoptively transferred into C57BL/6 (CD45.1+) mice. This evidence concerns the gene CD8A and infection.