Genetically encoded reporters for optical measurements of presynaptic activity hold significant promise for measurements of neurotransmission within intact or semi-intact neuronal networks. We have characterized pH-sensitive green fluorescent protein-based sensors (pHluorins) of synaptic vesicle cycling at nerve terminals. pHluorins have a pK ∼ 7.1, which make them ideal for tracking synaptic vesicle...
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