Helios expression and Foxp3 TSDR methylation of IFNy+ and IFNy- Treg from kidney transplant recipients with good long-term graft function - Trojan, Karina; Unterrainer, Christian; Morath, Christian; Aly, Mostafa Gaafa; Opelz, Gerhard; Daniel, Volker (PLOS ONE, 2017)