When CD10+GPR77+‐depleted CAFs were transduced with CD10‐expressing lentivirus, forced expression of CD10 significantly enhanced the capacity of CAFs to increase mammosphere formation and ALDH1+/CD44high CD24low percentage of cocultured tumor cells (Figure 2I–K; Figure S2K–M, Supporting Information). The gene discussed is ALDH1A1; the disease is neoplasm.