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Nervous System Practice Test Question

How many of the following are NTSs that are located only in the CNS?
*epinephrine *Glutamic acid *Serotonin *GABA *Dopamine *Glycine
a. none
b. one
c. two
d. three
e. four
f. five


I think there are five NTSs (Epinephrine, Glutamic acid, Serotonin, GABA, and Glycine) that are only found in CNS if I am not wrong.