In the peripheral blood, 16 days after transplantation, we found a mild increase in leukemia cells in Cxcl12−/− EC mice and Cxcl12−/− MPC mice compared with Cxcl12+/+ recipient mice (Figure 6B), but no difference in survival between the groups was observed (Figure 6C). Here, CXCL12 is linked to leukemia.