You are investigating the effects of a newly discovered cell type. You have an intact synapse (including pre- and post-synaptic neurons) in a dish and observe what happens upon electrical stimulation. Following electrical stimulation of the pre-synaptic neuron, you record an action potential in the pre-synaptic neuron and an EPSP in the post-synaptic neuron. The synapse most likely utilizes which of the following neurotransmitters? Sodium (Na++) GABA Calcium (Ca++)

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