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A genetic system for tracking regulatory T (Treg) cell stability. (a) Mouse gene constructs used in generation of Foxp3-GFP-Cre-Rosa-YFP (FCRY) mice. (b) expected fluorescence patterns for conventional T (Tconv) cells, transient Treg, stable Treg and exTreg cells. (c) Sample flow plot for GFP by YFP in spleen cells from a FCRY mouse.
