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Determining the activity of a regulatory T-cell population in vitro is often the first step in analyzing its function. To obtain reliable and reproducible results, it is critical to follow the protocol that is most applicable to your experimental question. We have outlined below a basic in vitro suppression assay as well as a variety of alternative/additional protocols that can be utilized alone or in combination as desired.
Collison et al. (Sat,) studied this question.