1. Fraunhofer Institute for Molecular Biology and Applied Ecology (IME), Forckenbeckstr. 6, 52074 Aachen, Germany
2. Division of Virology, Department of Medical Microbiology, UK Aachen, RWTH Aachen, Pauwelsstr. 30, 52074 Aachen, Germany
3. Institute for Molecular Biotechnology (IMB), RWTH Aachen, Worringerweg 1, 52074 Aachen, Germany