occurs in occurs in regulates regulates has primary input protein chemical synaptic transmission catabolic process synapse protein catabolic process, modulating synaptic transmission Any protein degradation process, occurring at a presynapse, that regulates synaptic transmission. Note that this term was created for the SynGO project, and will be obsoleted when the SynGO annotations are made in Noctua. GO:0099546 biological_process protein catabolic process at synapse