What is the mechanism of LTP expression?   Select one: a. Increase in the number of postsynaptic NMDA receptors   b.  Increase in the intracellular level of proteins involved in synaptic release   c. Increase in the number of postsynaptic AMPA receptors   d. Increase in the number of presynaptic AMPA receptors   e. Decrease in the level of glutamate released into the synaptic cleft

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