Inhibition of adenosine kinase rescues thymocyte development within ADA-inhibited FTOC. FTOCs were performed with C57BL/6 thymuses at day 15 of gestation in media alone (a), 5 μM dCF (b), 1 μM 5′A5′dAdo (c), or 5 μM dCF plus 1 μM 5′A5′dAdo (d). After 5 days, thymocytes were harvested, counted, and stained with FITC-anti-CD4, PE-anti-CD8, and PI to exclude dead cells. The data are representative of one experiment out of four.