A presynaptic (axo-axonal) synapse
A. is any synapse onto a cell body, and they can be either stimulatory or inhibitory.
B. is a synapse between an axon terminal and a dendrite that can be either excitatory or inhibitory.
C. is a synapse between an axon terminal and another axon's terminal that can be either excitatory or inhibitory.
D. is a synapse between an axon terminal and another axon's terminal that is always inhibitory.
E. is a synapse between an axon terminal and a dendrite of the same cell, which is always inhibitory.
Answer: C
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