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John Williams, PhD   Give us a general overview of what a
neurotransmitter is and what it does.  A neurotransmitter is a
molecule that's released from the terminals of neurons, the very
ends of the neurons, and it traverses a gap between neurons, and
it activates receptors on the other side of the gap and signals
either excitation on inhibition.  What is a neurotransmitter
transporter?  There are a number of different ways that the
actions of neurotransmitters are terminated. Sometimes they're
metabolized into inactive molecules. Other times they're taken
out of the extracellular solution thr