The unique aspect of norepinephrine (NE) release is that
a. axonal varicosities release NE.
b. NE release does not require the entry of calcium ions.
c. black widow spider venom can block NE release.
d. amphetamine does not modify NE release.
e. NE can be released from glial cells.
Answer: a. axonal varicosities release NE.
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