MPPE1 and neoplasm: Remarkably, using H2Kb/SIINFEKL dextramer staining, the proportion of tumour antigen-specific CD8+ T cells within the total CD8+ T-cell population was significantly increased in OVA-vaccinated mice and a trend was visible in cDC1-vaccinated, but not in cDC2-vaccinated mice (Supplementary Fig. 9B).