Stem cell characteristics in glioblastoma are maintained by the ecto-nucleotidase E-NPP1 - Josephine Bageritz; Laura Puccio; Rosario M. Piro; Volker Hovestadt; Emma Phillips; Teresa Pankert; Jennifer Lohr; Christel Herold‐Mende; Peter Lichter; Violaine Goidts (2014)