Flow cytometry analysis of T cell apoptosis was performed using the Annexin V-PE kit (BD Biosciences, San Jose, California, USA) as previously described (27 (link)). Briefly, T cells were incubated with various concentrations of rHcABHD proteins (0, 10, 20, 40, and 80 μg/mL) followed by staining with annexin V and 7-Aminoactinomycin D (7-AAD) based on the manufacturer's protocol. The PBS-treated goat T cells were served as negative controls. Three independent experiments were performed and each experiment was run in triplicate.
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