Interestingly, we observed co-expression of her4.1:mScarlet/rag2:EGFP and her4.1:mScarlet/mpeg1.1:EGFP in p53EPS tumors (Figure 2F–I), suggesting promoter activity at certain immune-associated genes within established p53EPS tumor cells in vivo. This evidence concerns the gene RAG2 and neoplasm.