CD27 and infection: Indeed, approximately 50% of HIV-1BAL-infected (p24+) T cells were central memory CD45RO+/CD27+/CD62L+ T cells on day 6 post-infection (p.i.), and 10–20% of infected cells were effector memory (TEM)CD45RO+/ CD27−/CD62L+/− cells (Fig. 5a, Fig. Supplementary Figure 5E).