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Influence of calcium and magnesium ions on the actin network in dark-adapted and weak light-irradiated cells. Samples were incubated for 2 h with 5 mM Ca2+ (A, C) or 5 mM Mg2+ (B, D). Actin cytoskeleton in the dark-adapted cells (A, B) and after irradiation with continuous weak red light for 1 h (C, D). Scale bars, 10 μm.
