Synaptic vesicles (SVs) are clustered in the presynaptic terminals and consistently trafficking along axons. Based on their release features, SVs are classified into different “pools”. Imaging of SVs that are traveling among multiple presynaptic terminals has helped define a new pool named “SV super-pool”. Here we describe a Fluorescent Recovery After Photobleaching (FRAP) approach to elucidate the relationship between SVs from the super-pool with SV clusters at presynaptic terminals. This method is powerful to investigate SV mobility regulation mechanisms.
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