Changes in cortical hippocampal ectonucleotidase activities in mice lacking cellular prion protein - Pereira, Grace Schenatto; Walz, Roger; Bonan, Carla Denise; Battastini, Ana M. O.; Izquierdo, Ivan; Martins, Vilma Regina; Brentani, Ricardo R.; Sarkis, João J. F. (Neuroscience Letters, 2001)