Similarly, there may be significant flexibility in converting from one phenotype to another, depending on their local antigen or cytokine environment Appay et al. 2002 , Wherry et al. 2003b .
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Similarly, there may be significant flexibility in converting from one phenotype to another, depending on their local antigen or cytokine environment Appay et al. 2002 , Wherry et al. 2003b .