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The brain is composed of millions of interconnecting nerve cells called neurons. In order for a person to think, move, or feel, these neurons must communicate with one another. They do so by sending and receiving chemical messengers called neurotransmitters.

When a neurotransmitter is released from a neuron, it crosses a cleft, or synapse, and binds to a receptor on another neuron; thus the signal is passed on.

Unlike the blues, sadness, or even grief, depression ... more