A and B, simulated time courses of amount of active PKC (A) and non-phosphorylated AMPARs (B) before and after the conditioning [Ca2+]i and glutamate increase in a model in which the amount of CaMKII is reduced to 10% without or with additional 50% reduction of PP-2A, PP-1, or calcineurin (CaN). C, relation between the amount of PP-2A, PP-1 or CaN and non-phosphorylated AMPAR fraction at 30 min after the conditioning stimulation.