1. Molecular Biology Division, Biomedical Center, Ludwig-Maximilians-University München, D-82152 Martinsried, Germany
2. Bioinformatic Core Facility, Biomedical Center, Ludwig-Maximilians-University München, D-82152 Martinsried, Germany
3. Helmholtz Zentrum München, Institute of Stem Cell Research, Ingolstädter Landstraße 1, D-85764 Neuherberg-München, Germany