Autologous stem cells are cells that come from your own body while allogeneic stem cells come from someone else. The body precisely tolerates its own autologous cells but has a very strong immune reaction to cells that are not its own. For cellular treatment, allogeneic stem cells must be cultured long enough so that they are immune-compromised, and patients typically take immune-suppression drugs to better tolerate them. Autologous stem cells are preferred for regenerative therapy because they are precisely tolerated in the body. Autologous cells (your own cells) eliminate the immune response and rejection of the cellular implant compared to allogeneic cells (someone else’s cells).