"Cerebellar learning depends on expression of GluA3 in Purkinje cells. GluA3 is required to induce long term potentiation (LTP) but not long term depression at parallel fiber-Purkinje cell synapses. GluA3-dependent potentiation involves a cAMP-driven change in channel conductance. GluA3-mediated LTP and learning are induced via cAMP-mediated Epac activation."xsd:string