To confirm the involvement of CCL19 and CCL22 in T-cell migration, we analyzed CCL19 and CCL22 secretion by DCs (comprising PDC, cDC1, and cDC2), purified from healthy donors blood, that were cocultured for 24 hours in the presence or not of neuroblastoma cell lines and activated or not. The gene discussed is MPPE1; the disease is neuroblastoma.