Ve CRE sites were able to bind recombinant CRE binding-bZIP proteins, conditions under which these CRE sites come into play in native neurons are unknown. GluA1 receptors (like all AMPA receptor subunits) are expressed by neurons and glial cells in vivo and in vitro (Gallo and Ghiani, 2000), but the density of functional receptors is much lower in astrocytes than neurons. In oligodendrocyte progen