To further investigate how BCL9/BCL9L regulates the functions of cDC1, we explored the transcriptional differences of CD8+ T cells and cDC1 in TdLNs and tumors from B16-OVA tumor-bearing Bcl9/Bcl9l deficiency mice using single-cell transcriptomics analysis. The gene discussed is MPPE1; the disease is neoplasm.