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. 2014 Apr 22;5:153. doi: 10.3389/fphys.2014.00153

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Copyright © 2014 Immonen, Krause, Krause, Frolov, Vähäsöyrinki and Weckström.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Ca²⁺-dependence of macroscopic light-induced currents. (A) Normalized responses to a 10 ms flash (arrow) at different Ca²⁺ concentrations. The flash was estimated to contain ~200 effective photons over the whole concentration range. (B) Responses to a 10 s light pulse (bars) at 1.5 mM and “0” extracellular Ca²⁺. Relative light intensities are indicated above the light stimulus bars. (C) Comparison of average plateau currents (10 s light pulse) of four cells at 1.5 mM and “0” [Ca²⁺] plotted as function of relative light intensity.