Flow cytometry assays were performed for T cell apoptosis determination using the Annexin V-PE kit (BD Biosciences, San Jose, CA, USA) as previously described [28 (link)]. In brief, freshly sorted T cells were cultured in the presence of tested doses of rHcADRM1 proteins (0, 5, 10, 20 and 40 µg/ml) followed by Annexin V and 7-aminoactinomycin D (7-AAD) staining based on the kit’s specification. The PBS-stimulated T cells served as negative controls. Three individual tests, each in triplicate, were conducted.
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