T cells were activated using 2 μM thapsigargin (TG; MilliporeSigma) or with plate-bound mouse anti-human CD3 (10 μg/ml) and mouse anti-human CD28 (10 μg/ml) antibodies (BioLegend) as previously described (21 (link)). In experiments where IFNγ was measured using enzyme-linked immunosorbent assay (ELISA), some cells were activated with phytohemagglutinin (10 μg/ml). The activation protocol and activation times for each experiment are described in the individual figure legends.