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Ca2+ dependence of postsynaptic currents in OFF bipolar and horizontal cells evoked by flash photolysis of caged Ca2+ in rods. (A) Latency to beginning of postsynaptic versus intraterminal [Ca2+] measured using OGB-6F. (B) Latency to the peak of the postsynaptic current versus [Ca2+]. Squares, rods; triangles, cones.
