Some students were helping me with experiments that are mentioned here. From all
of them I would like to thank Benjamin Waldmann and Marcel Lietz who were the first
students and who I kept contact over the time. Also Monika Alter and Tobias Fister
who convinced me to take one more group of students should be mentioned as they
generated data that explained a lot.
I asked friends to proof-read one part or the other of this work. Dr. Meike Römer, Dr.
Katrin Kinkel, Dr. Cornelius Pompe, Torge Schiefelbein, Dr. Martin Meyer, I really
thank you for the quick responses and the scientific input I got.