Source:http://linkedlifedata.com/resource/umls/id/C1516988
GO: A synapse in which an action potential in the presynaptic cell increases the probability of an action potential occurring in the postsynaptic cell. [GOC:dph, GOC:ef],NCI: A synapse in which the firing of the presynaptic cell increases the probability of firing of the postsynaptic cell. (On-line Medical Dictionary)