CD137+CD154− Expression As a Regulatory T Cell (Treg)-Specific Activation Signature for Identification and Sorting of Stable Human Tregs from In Vitro Expansion Cultures oleh Anna Nowak, Dominik Lock, Petra Bacher, Thordis Hohnstein, Katrin Vogt, Judith Gottfreund, Pascal Giehr, Julia K. Polansky, Birgit Sawitzki, Andrew Kaiser, Jörn Walter, Alexander Scheffold, Alexander Scheffold