ID3 and infection: While Id3 expression was found to delineate TH1 cells with memory potential as early as day 7 after infection with LCMV-Armstrong (Shaw et al., 2022), its expression was not identified at the early time points after infection with L. monocytogenes, suggesting that acquisition of memory potential in TH1 phenotype cells may be a relatively rare event not captured in this dataset or may occur at later time points not analyzed here (https://cd4t-differentiation-dashboard.com).