a: Neurotransmitter ~
b: writing a letter

What: "A typical neurotransmitter is like a letter. It sends information. You keep paper in your house for when you need to write a letter, then you send it (and could watch it travel to its destination, if you wanted to) and it is received by one person."

Writer: Ellen Kuwana
Date: Apr 29 2013 6:23 PM

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