1 Institute of Biochemistry II, Goethe University Frankfurt-Medical Faculty, University Hospital, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany.
2 Institute of Biochemistry II, Goethe University Frankfurt-Medical Faculty, University Hospital, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany. dikic@biochem2.uni-frankfurt.de.
3 Buchmann Institute for Molecular Life Sciences, Goethe University Frankfurt, Max-von-Laue-Straße 15, 60438 Frankfurt am Main, Germany.