While characterizing the activities of several neurons,you find a neuron with the following properties: (1)When stimulated,the neuron fails to release neurotransmitters into the synaptic cleft.
(2)Microinjection of calcium ions calcium ions has no effect on the neuron.(In other neurons such microinjection stimulates the t-SNARE and v-SNARE complex interaction that promotes neurotransmitter secretion.)
The abnormality in this neuron is most likely associated with the function of