at least three criteria should be fulfilled before it can be concluded that one neurone may use more than one neurotransmitter ( or neuromodulator ) for synaptic transmission : such putative neurotransmitters must be located in this particular neurone : they must be released from the neurone under physiological conditions , and : they must exert separately or together pre- and/or post-synaptic effects .
C0027793
synaptic
C0027908
neurotransmitters