Figure 1. 
FIG. 1. A diagram illustrating some of the most important potential sites of action of barbiturates at a hypothetical central synapse. (1) voltage-gated calcium channels in the presynaptic nerve terminal, (2) the potsynaptic glutamate receptor, (3) the postsynaptic GABAA receptor, (4) voltage-gated sodium channels in the postsynaptic neuron.
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published 2000